Goal

Build a basic campaign prioritization model using all relevant variables extracted from the database and identified in previous work.

Setup

library(tidyverse)
library(reshape2)
library(gridExtra)
library(splines)
library(lubridate)
library(wranglR)
library(Boruta)
library(foreach)
library(doParallel)
library(glmnet)
library(glmnetUtils)
# Functions adapted from previous analysis steps
source('code/functions.R')
# Visualization functions adapted fron previous analysis steps
source('code/functions_viz.R')
# Set number of available CPU cores
registerDoParallel(detectCores() - 1)

KSM model goals

The overarching goal is to predict giving over the final two years of the campaign. Ideally, I’d want to find expected future value, not just difference from expected value today. Consider the following:

\[ E \left( \text{giving, donor | covariates} \right) = E \left(\text{giving | donor, covariates} \right) P \left(\text{donor | covariates} \right) \]

Estimate the expected future value as the product of an expected value and a probability. This can also be thought of as separate capacity and affinity models, and should give more useful estimates than \(E\left( \text{giving | covariates} \right)\), which is left-censored by $0.

It’ll be informative seeing what features are more or less important at each stage of the two-step procedure, though I expect overall accuracy to suffer somewhat. Down the road it would be interesting to compare this to other methods, like trees and boosting.

KSM model variables

The target variable is the sum of new gifts and commitments from 9/1/16 to 8/31/18 (FY17-18), given the state of the database on 8/31/16 (FY16).

As a general principle, point-in-time data is derived from entered date ranges where possible. Where dates are missing, it will be based upon the date added or date modified audit trail for each field, as suitable. The following data types received this treatment:

  • All dollar amounts
  • All giving behavior counts and years
  • Student/alumni status
  • All prospect assignments and ratings
  • All contact information and indicators
  • Employment
  • Visits and outreach
  • Engagement counts

This is implemented by this SQL code.

# Parameters
train_fy <- 2016
filepath <- 'data/2018-11-30 point-in-time data.xlsx'
sheetname <- 'Select point_in_time_model'
# Import data
source('code/generate-pit-data.R')
# Run data generation function
modeling.data <- generate_pit_data(filepath, sheetname)
 27249 failed to parse.
# Create response variables
modeling.data <- modeling.data %>% mutate(
  rv.amt = NGC_TARGET_FY2 + NGC_TARGET_FY1
  , rv.gave = rv.amt > 0
) %>% select(
  # Drop future data
  -NGC_TARGET_FY2
  , -NGC_TARGET_FY1
  , -CASH_TARGET_FY2
  , -CASH_TARGET_FY1
  , -PLEDGE_TARGET_FY2
  , -PLEDGE_TARGET_FY1
  , -AF_TARGET_FY2
  , -AF_TARGET_FY1
  , -CRU_TARGET_FY2
  , -CRU_TARGET_FY1
) %>% filter(
  # Drop entities whose RECORD_YR is after the training year
  RECORD_YR <= train_fy
)

Probability model

Logistic regression has been the workhorse of fundraising models for years. Some special considerations for this application:

  • Minimizing predictive error, e.g. finding the model \(\text{argmin}_m \sum_i \left[ y_i - \widehat{m}_x(x_i) \right]^2\), on in-sample data is the wrong metric!
  • Focus on identifying as many current prospects as possible (minimizing type II error); type I is acceptable as these become new prospects.
  • Avoid overfitting the training data. Techniques like cross-validation are highly recommended.
  • Avoid endogenous variables; in this context, that means those that are causally associated with the outcome being measured, e.g. don’t use Lifetime.Giving as a predictor if the response variable is Largest.Gift.

I have previously found that penalized logistic regression, such as implemented in R by the glmnet package, works better than standard logistic regression, so that’s the technique that I’ll use here.

Here, the response variable is:

\[ Y_i = I \left( \text{FY18Giving}_i + \text{FY17Giving}_i > 0 \right) \]

Variable selection

I like computing random forest variable importance, e.g. Sauve & Tuleau-Malot (2014), to pre-screen variables. Define variable importance in a random forest as the change in MSE when permuting a given observation vector. One nice feature is that highly correlated variables should be similarly important.

# Sample rows
prop = 1/5 # Proportion of data to sample
set.seed(287092)
samp <- sample_n(modeling.data, size = nrow(modeling.data) * prop)
# Run Boruta algorithm
rf.vars <- Boruta(
    y = as.numeric(samp$rv.gave)
    , x = samp %>% select(-rv.amt, -rv.gave)
    , seed = 5993207
  )
Computing permutation importance.. Progress: 65%. Estimated remaining time: 16 seconds.
Computing permutation importance.. Progress: 63%. Estimated remaining time: 18 seconds.
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Computing permutation importance.. Progress: 65%. Estimated remaining time: 16 seconds.
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Computing permutation importance.. Progress: 69%. Estimated remaining time: 13 seconds.
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Computing permutation importance.. Progress: 70%. Estimated remaining time: 13 seconds.
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Computing permutation importance.. Progress: 68%. Estimated remaining time: 14 seconds.
Computing permutation importance.. Progress: 90%. Estimated remaining time: 3 seconds.
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rf.vars %>% print()
Boruta performed 99 iterations in 1.03996 hours.
 101 attributes confirmed important: AF_PFY1, AF_PFY2, AF_PFY3, AF_PFY4, AF_PFY5 and 96
more;
 43 attributes confirmed unimportant: ACTIVITIES_CFY, ACTIVITIES_PFY1,
COMMITTEE_KSM_ACTIVE, COMMITTEE_KSM_LDR, COMMITTEE_KSM_LDR_ACTIVE and 38 more;
 7 tentative attributes left: ACTIVITIES_PFY2, ACTIVITIES_PFY3, ACTIVITIES_PFY4,
HAS_BUS_EMAIL, HOUSEHOLD_CITY and 2 more;

Save the results.

save(rf.vars, file = 'data/rf.vars.Rdata')

Plot the results.

(pmod_plot <- rf.vars %>% Borutadata() %>% Borutaplotter())

Basically, the algorithm creates dummy “shadow” variables, which are permuted versions of the explanatory variables appearing above, and random forests are fit on both the real and dummy variables. Intuitively, if replacing a variable with a randomly permuted version of itself does not reduce the random forest classifier’s accuracy, then the variable should not be included in a final model and can be discarded.

Recall that the response variable is making a new gift or commitment at any level within the next two years. From past experience, I know that most donations are outright gifts, under $1,000, and to an annual giving allocation. So the following is not too surprising:

  • Past giving is the best predictor of future giving
  • More recent giving behavior is more predictive than less recent giving behavior
  • Other engagement indicators (e.g. events, committees) are predictive in aggregate
  • Cash is more predictive than new gifts & commitments
  • Having active home contact information is predictive

I found these more surprising:

  • Having business contact information is not predictive
  • Prospect indicators (is a prospect, number of visits, rating, etc.) are only weakly predictive
  • ID numbers are predictive, but other personal identifiers like name are not – presumably because of the ID number/age correlation?
  • KSM-specific engagement is more predictive than NU engagement
(recommended.vars <- TentativeRoughFix(rf.vars))
Boruta performed 99 iterations in 1.03996 hours.
Tentatives roughfixed over the last 99 iterations.
 101 attributes confirmed important: AF_PFY1, AF_PFY2, AF_PFY3, AF_PFY4, AF_PFY5 and 96
more;
 50 attributes confirmed unimportant: ACTIVITIES_CFY, ACTIVITIES_PFY1, ACTIVITIES_PFY2,
ACTIVITIES_PFY3, ACTIVITIES_PFY4 and 45 more;
# Check variable correlations
recommended_vars <- recommended.vars$finalDecision[
  which(recommended.vars$finalDecision == 'Confirmed')] %>% names()
numeric_vars <- modeling.data %>%
  select(recommended_vars) %>%
  select(-ID_NUMBER, -HOUSEHOLD_ID) %>%
  select_if(is.numeric)
numeric_vars %>% plot_corrs(textsize = 2)

This is the correlation matrix for all 74 numeric variables confirmed important by the algorithm.

  • AF, cash, and CRU are not as highly correlated as I would’ve expected. However, AF and CRU are moderately highly correlated, AF’s definition has changed over time, so consider using CRU and cash only.
  • Count of gifts and payments, count of cash gifts, count of FYs supported, and count of allocations supported are all highly correlated. Consider dropping some of them.

Cross-validation

Begin by creating the modeling data file.

# Data file with variables removed
mdat <- modeling.data %>% select(rv.gave, recommended_vars) %>%
  select(
    -VELOCITY3_NGC, -VELOCITY_BINS_NGC, -VELOCITY_BINS_CASH, -VELOCITY3_LIN_NGC
    , -GIVING_MAX_PLEDGE_YR, -GIVING_MAX_PLEDGE_FY, -CRU_STATUS
    , -NGC_PFY1, -NGC_PFY2, -NGC_PFY3, -NGC_PFY4, -NGC_PFY5
    , -AF_PFY1, -AF_PFY2, -AF_PFY3, -AF_PFY4, -AF_PFY5
    , -GIVING_MAX_CASH_FY, -GIVING_NGC_TOTAL, -UPGRADE3_NGC, -LOYAL_5_PCT_ANY
    , -DEGREES_CONCAT, -BIRTH_DT, -FIRST_KSM_YEAR
    , -ID_NUMBER, -INSTITUTIONAL_SUFFIX # Keep HHID but don't use in modeling
    , -KSM_GOS, -HOUSEHOLD_COUNTRY
    , -KSM_EVENTS_ATTENDED, -EVENTS_ATTENDED
  ) %>% mutate(
    # Create spouse flag
    SPOUSE_ALUM = ifelse(SPOUSE_FIRST_KSM_YEAR > 0, 'TRUE', 'FALSE') %>% factor()
  ) %>% mutate_if(
    # Numeric variables over 1E4 get a log10 transformation
    function(x) {
      ifelse(is.numeric(x), max(x) >= 1E4, FALSE)
    }
    , log10plus1
  )
# Cross-validation settings
folds = 10
reps = 5
# Withhold 10% of data as test set
xv <- KFoldXVal(mdat, k = 2, prop = .1, seed = 4960582)
holdoutdat <- mdat[xv[[1]], ]
traindat <- mdat[xv[[2]], ]
remove(xv)

Recommendations

  • 10-fold cross-validation repeated 5 times
  • Estimate prediction error with out-of-sample classification error
  • \(\theta_{1}\) threshold (donors) set to the empirical probability in the cross-validation set
  • Try to preserve continuous variables; reasonable monotonic transformations are fine, but avoid discretization

Baseline penalized logistic regression

I’ll use a penalized ridge regression model as implemented by glmnet. Advantages of shrinkage techniques include automatically controlling for overfitting and collinearity.

# Store timings
glm_ridge_baseline_timestamps <- list()
# Store model errors
glm_nospline <- list()
# Seed for reproducibility
set.seed(2934223)
# Outer loop (repetitions)
for (rep in 1:reps) {
  # Status report 
  timestamp <- paste('+ Iteration', rep, 'beginning at:', Sys.time())
  print(timestamp)
  glm_ridge_baseline_timestamps <- c(glm_ridge_baseline_timestamps, timestamp)
  # Create cross-validation indices
  xv <- KFoldXVal(traindat, k = folds)
  # Inner loop (parallel cross-validation)
  errs_out <- foreach(
    fold = 1:length(xv)
    , .combine = c
    , .packages = c('glmnet', 'glmnetUtils', 'dplyr', 'splines')
  ) %dopar% {
    # Fit temp model, where alpha = 0 is the ridge regression penalty
      tmpmodel <- cv.glmnet(
        rv.gave ~ .
        # Train while withholding some data
        , data = traindat[-xv[[fold]], ] %>% select(-HOUSEHOLD_ID)
        , family = 'binomial'
        , alpha = 0
        , lambda = 2^(-8:5)
      )
    # Prediction threshold
    theta1 <- sum(traindat$rv.gave[-xv[[fold]]] == 1) / nrow(traindat[-xv[[fold]], ])
    # Confusion matrix based on the withheld data
    tmpconfus <- conf_matrix_glmnet(tmpmodel, newdata = traindat[xv[[fold]], ], rv = 'rv.gave', threshold = theta1)
    # Return results
    return(
      list(
        conf_matrix = tmpconfus$conf_matrix
        , conf_matrix_pct = tmpconfus$conf_matrix_pct
        , errors = data.frame(
          reps = rep
          , folds = fold
          , error = tmpconfus$error
          , precision = tmpconfus$precision
          , sensitivity = tmpconfus$sensitivity
          , F1_score = tmpconfus$F1_score
        )
      )
    )
  }
  # Write results to errors data frame
  glm_nospline <- c(glm_nospline, errs_out)
  # Status report
  timestamp <- paste(' -Iteration', rep, 'ending at:   ', Sys.time())
  print(timestamp)
  glm_ridge_baseline_timestamps <- c(glm_ridge_baseline_timestamps, timestamp)
}
[1] "+ Iteration 1 beginning at: 2018-12-21 11:47:32"
[1] " -Iteration 1 ending at:    2018-12-21 11:49:40"
[1] "+ Iteration 2 beginning at: 2018-12-21 11:49:40"
[1] " -Iteration 2 ending at:    2018-12-21 11:51:49"
[1] "+ Iteration 3 beginning at: 2018-12-21 11:51:49"
[1] " -Iteration 3 ending at:    2018-12-21 11:53:57"
[1] "+ Iteration 4 beginning at: 2018-12-21 11:53:57"
[1] " -Iteration 4 ending at:    2018-12-21 11:56:01"
[1] "+ Iteration 5 beginning at: 2018-12-21 11:56:01"
[1] " -Iteration 5 ending at:    2018-12-21 11:58:16"
glm_ridge_baseline_timestamps %>% unlist() %>% print()
 [1] "+ Iteration 1 beginning at: 2018-12-21 11:47:32"
 [2] " -Iteration 1 ending at:    2018-12-21 11:49:40"
 [3] "+ Iteration 2 beginning at: 2018-12-21 11:49:40"
 [4] " -Iteration 2 ending at:    2018-12-21 11:51:49"
 [5] "+ Iteration 3 beginning at: 2018-12-21 11:51:49"
 [6] " -Iteration 3 ending at:    2018-12-21 11:53:57"
 [7] "+ Iteration 4 beginning at: 2018-12-21 11:53:57"
 [8] " -Iteration 4 ending at:    2018-12-21 11:56:01"
 [9] "+ Iteration 5 beginning at: 2018-12-21 11:56:01"
[10] " -Iteration 5 ending at:    2018-12-21 11:58:16"
# Function to reshape list data
combine_xval <- function(xval_results = list()) {
  # Function to reformat list output into groups
  delister <- function(full_list, first_idx = 1, seq) {
    output <- list()
    idx <- seq(first_idx, length(full_list), by = seq)
    for (i in 1:length(idx)) {
      output <- c(output, full_list[idx[i]])
    }
    return(output)
  }
  # Separate the output into groups of 3
  conf_matrix = delister(xval_results, 1, 3)
  conf_matrix_pct = delister(xval_results, 2, 3)
  errors = delister(xval_results, 3, 3)
  # Turn errors into a data frame
  errors <- foreach(i = 1:length(errors), .combine = rbind) %do% {
    return(errors[[i]])
  } %>% data.frame()
  # Return organized list
  return(
    list(
      conf_matrix = conf_matrix
      , conf_matrix_pct = conf_matrix_pct
      , errors = errors
    )
  )
}
# Save results
glm_ridge_baseline_results <- combine_xval(glm_nospline)
glm_ridge_baseline_model <- cv.glmnet(
        rv.gave ~ .
        , data = traindat %>% select(-HOUSEHOLD_ID)
        , family = 'binomial'
        , alpha = 0
      )
save(
  glm_nospline
  , glm_ridge_baseline_model
  , glm_ridge_baseline_results
  , glm_ridge_baseline_timestamps
  , file = 'data/glm_ridge_baseline.Rdata'
)
grid.arrange(
    histogrammer(glm_ridge_baseline_results$errors, 'error', h = .0005, fill = 'pink')
  , histogrammer(glm_ridge_baseline_results$errors, 'precision', h = .005, fill = 'cyan')
  , histogrammer(glm_ridge_baseline_results$errors, 'sensitivity', h = .005, fill = 'green')
)

Let TP, TN, FP, FN refer to true positives, true negatives, false positives, and false negatives respectively.

\[ \text{error} = \frac{FP + FN}{n}\] \[ \text{precision} = \frac{TP}{TP + FP}\] \[ \text{sensitivity} = \frac{TP}{TP + FN}\]

Compared to the AF $10K model, this has higher error due to the decreased sensitivity, but much higher precision.

The metrics to beat so far:

(
glm_baseline_err <- data.frame(
  glm_ridge_baseline = glm_ridge_baseline_results$errors %>%
    select(-reps, -folds) %>%
    colMeans()
)
)

Standard logistic regression

Consider a standard logistic regression model to get a better sense of the explanatory variables.

glm_standard <- glm(
  rv.gave ~ .
  , data = traindat %>% select(-HOUSEHOLD_ID) %>%
    select(-RECORD_STATUS_CODE) # Results in separation if included
  , family = 'binomial'
)
summary(glm_standard)

Call:
glm(formula = rv.gave ~ ., family = "binomial", data = traindat %>% 
    select(-HOUSEHOLD_ID) %>% select(-RECORD_STATUS_CODE))

Deviance Residuals: 
    Min       1Q   Median       3Q      Max  
-2.9841  -0.2635  -0.1401  -0.0360   3.8324  

Coefficients:
                                   Estimate Std. Error z value Pr(>|z|)    
(Intercept)                      -7.499e+01  6.128e+00 -12.236  < 2e-16 ***
PROGRAM_GROUPNONE                -1.188e+00  1.247e-01  -9.532  < 2e-16 ***
PROGRAM_GROUPEMP                 -1.106e-01  6.141e-02  -1.801 0.071769 .  
PROGRAM_GROUPEXECED              -3.005e+00  3.920e-01  -7.665 1.79e-14 ***
PROGRAM_GROUPNONGRD              -1.433e+00  5.230e-01  -2.741 0.006128 ** 
PROGRAM_GROUPPHD                  1.297e-01  2.074e-01   0.625 0.531723    
PROGRAM_GROUPTMP                 -2.372e-01  5.288e-02  -4.486 7.26e-06 ***
SPOUSE_FIRST_KSM_YEAR             1.462e-02  7.415e-03   1.972 0.048631 *  
PREF_ADDR_TYPE_CODEALT           -4.584e-01  1.745e-01  -2.627 0.008620 ** 
PREF_ADDR_TYPE_CODEBUS            4.098e-03  7.477e-02   0.055 0.956296    
HOUSEHOLD_CONTINENT              -2.239e+00  1.508e-01 -14.846  < 2e-16 ***
HOUSEHOLD_CONTINENTAfrica        -2.104e+00  1.052e+00  -1.999 0.045563 *  
HOUSEHOLD_CONTINENTAsia          -2.662e-01  9.017e-02  -2.952 0.003155 ** 
HOUSEHOLD_CONTINENTEurope        -9.274e-01  1.249e-01  -7.428 1.10e-13 ***
HOUSEHOLD_CONTINENTOceania       -1.211e+00  4.513e-01  -2.684 0.007279 ** 
HOUSEHOLD_CONTINENTSouth America -5.347e-01  1.764e-01  -3.032 0.002428 ** 
BUS_IS_EMPLOYEDTRUE               2.764e-01  5.995e-02   4.611 4.01e-06 ***
HAS_HOME_ADDRTRUE                -1.563e-01  4.044e-02  -3.865 0.000111 ***
HAS_HOME_PHONETRUE               -4.271e-01  4.205e-02 -10.157  < 2e-16 ***
HAS_HOME_EMAILTRUE                1.904e-01  5.017e-02   3.795 0.000148 ***
GIVING_FIRST_YEAR                 4.110e-03  3.814e-03   1.078 0.281245    
GIVING_FIRST_YEAR_CASH_AMT       -7.195e-02  2.705e-02  -2.660 0.007818 ** 
GIVING_FIRST_YEAR_PLEDGE_AMT     -1.497e-02  3.146e-02  -0.476 0.634161    
GIVING_MAX_CASH_AMT              -1.866e-01  9.258e-02  -2.016 0.043822 *  
GIVING_MAX_PLEDGE_AMT            -1.017e-02  4.939e-01  -0.021 0.983573    
GIVING_CASH_TOTAL                 6.074e-01  1.235e-01   4.918 8.74e-07 ***
GIVING_PLEDGE_TOTAL              -1.158e-01  5.138e-01  -0.225 0.821659    
GIVING_AF_TOTAL                  -1.139e-02  3.296e-02  -0.346 0.729709    
GIVING_CRU_TOTAL                 -2.144e-01  8.502e-02  -2.522 0.011677 *  
GIFTS_ALLOCS_SUPPORTED            7.766e-02  2.237e-02   3.471 0.000518 ***
GIFTS_FYS_SUPPORTED               6.355e-02  9.809e-03   6.479 9.24e-11 ***
GIFTS_CASH                        2.578e-02  8.141e-03   3.167 0.001542 ** 
GIFTS_CREDIT_CARD1               -3.949e-02  6.314e-02  -0.625 0.531683    
GIFTS_CREDIT_CARD2+               4.717e-02  6.661e-02   0.708 0.478844    
GIFTS_OUTRIGHTS_PAYMENTS         -3.799e-02  8.402e-03  -4.522 6.13e-06 ***
GIFTS_PLEDGES                    -9.104e-02  7.531e-02  -1.209 0.226721    
CASH_PFY1                         3.288e-01  9.089e-02   3.618 0.000297 ***
CASH_PFY2                        -1.120e-02  8.314e-02  -0.135 0.892800    
CASH_PFY3                         2.028e-01  6.616e-02   3.065 0.002174 ** 
CASH_PFY4                         2.122e-01  4.674e-02   4.542 5.59e-06 ***
CASH_PFY5                        -1.544e-01  7.514e-02  -2.055 0.039838 *  
CRU_PFY1                         -9.195e-02  8.519e-02  -1.079 0.280431    
CRU_PFY2                         -5.880e-02  9.031e-02  -0.651 0.514998    
CRU_PFY3                         -2.353e-01  6.619e-02  -3.555 0.000378 ***
CRU_PFY4                          4.308e-02  4.686e-02   0.919 0.357879    
CRU_PFY5                         -9.747e-03  4.540e-02  -0.215 0.830006    
CRU_GIVING_SEGMENTDonor          -6.492e+00  7.658e+00  -0.848 0.396565    
CRU_GIVING_SEGMENTLapsed         -7.862e+00  7.640e+00  -1.029 0.303506    
CRU_GIVING_SEGMENTLoyal 2 of 3   -5.791e+00  7.663e+00  -0.756 0.449808    
CRU_GIVING_SEGMENTLoyal 3+       -4.654e+00  7.670e+00  -0.607 0.543964    
CRU_GIVING_SEGMENTLYBUNT         -6.570e+00  7.659e+00  -0.858 0.391034    
CRU_GIVING_SEGMENTNon            -8.363e+00  7.648e+00  -1.093 0.274178    
CRU_GIVING_SEGMENTPYBUNT         -7.322e+00  7.650e+00  -0.957 0.338532    
GIFT_CLUB_KLC_YRS                -1.127e-01  2.523e-02  -4.466 7.99e-06 ***
GIFT_CLUB_LOYAL_YRS              -1.462e-02  3.249e-02  -0.450 0.652674    
GIFT_CLUBS_CFY                    1.202e-02  2.514e-02   0.478 0.632533    
GIFT_CLUBS_PFY1                  -2.204e-02  3.406e-02  -0.647 0.517448    
GIFT_CLUBS_PFY2                  -8.213e-03  3.088e-02  -0.266 0.790250    
EVALUATION_LOWER_BOUND            9.227e-04  1.364e-02   0.068 0.946080    
UOR_LOWER_BOUND                   4.158e-03  1.932e-02   0.215 0.829626    
KSM_GOS_FLAGTRUE                  1.555e-01  1.538e-01   1.011 0.311966    
MONTHS_ASSIGNED                  -3.909e-03  3.065e-03  -1.275 0.202133    
COMMITTEE_NU_DISTINCT            -1.482e-02  3.213e-02  -0.461 0.644582    
COMMITTEE_NU_YEARS                2.340e-02  1.698e-02   1.378 0.168215    
COMMITTEE_KSM_DISTINCT            6.122e-02  3.169e-02   1.932 0.053347 .  
COMMITTEES_CFY                    8.539e-02  3.920e-02   2.179 0.029364 *  
COMMITTEES_PFY1                  -1.054e-02  3.263e-02  -0.323 0.746621    
COMMITTEES_PFY2                   9.016e-03  3.673e-02   0.245 0.806095    
COMMITTEES_PFY3                  -2.175e-02  3.306e-02  -0.658 0.510602    
EVENTS_YRS                        2.154e-02  8.308e-03   2.593 0.009513 ** 
EVENTS_PREV_3_FY                 -9.849e-02  3.050e-02  -3.230 0.001240 ** 
KSM_EVENTS_YRS                    1.581e-01  2.757e-02   5.735 9.74e-09 ***
KSM_EVENTS_PREV_3_FY             -5.342e-02  1.856e-02  -2.878 0.003996 ** 
KSM_EVENTS_REUNIONS1              7.776e-02  5.434e-02   1.431 0.152439    
KSM_EVENTS_REUNIONS2             -1.902e-01  8.835e-02  -2.153 0.031328 *  
KSM_EVENTS_REUNIONS3+            -5.487e-01  1.779e-01  -3.084 0.002045 ** 
EVENTS_CFY                        9.934e-02  3.232e-02   3.074 0.002114 ** 
EVENTS_PFY1                       9.554e-02  3.346e-02   2.855 0.004300 ** 
ATHLETICS_TICKET_YEARS            9.034e-03  2.599e-02   0.348 0.728140    
ATHLETICS_TICKET_LAST            -4.174e-05  6.988e-05  -0.597 0.550273    
RECORD_YR                         1.211e-02  2.597e-03   4.663 3.12e-06 ***
GIVING_MAX_CASH_YR                2.361e-02  2.997e-03   7.877 3.35e-15 ***
GIVING_MAX_CASH_MO2               3.805e-02  1.144e-01   0.333 0.739334    
GIVING_MAX_CASH_MO3               1.636e-02  1.054e-01   0.155 0.876686    
GIVING_MAX_CASH_MO4              -4.970e-02  1.041e-01  -0.477 0.633063    
GIVING_MAX_CASH_MO5               1.077e-01  9.933e-02   1.084 0.278198    
GIVING_MAX_CASH_MO6              -8.919e-02  1.009e-01  -0.884 0.376823    
GIVING_MAX_CASH_MO7               2.662e-02  1.108e-01   0.240 0.810133    
GIVING_MAX_CASH_MO8               5.940e-02  9.899e-02   0.600 0.548468    
GIVING_MAX_CASH_MO9               2.047e-03  1.259e-01   0.016 0.987028    
GIVING_MAX_CASH_MO10              1.567e-01  1.167e-01   1.343 0.179388    
GIVING_MAX_CASH_MO11              1.004e-01  1.086e-01   0.925 0.355095    
GIVING_MAX_CASH_MO12              2.081e-01  9.268e-02   2.245 0.024752 *  
GIVING_MAX_PLEDGE_MO2            -2.644e-01  9.747e-02  -2.712 0.006686 ** 
GIVING_MAX_PLEDGE_MO3            -1.080e-01  9.082e-02  -1.189 0.234571    
GIVING_MAX_PLEDGE_MO4            -2.955e-01  9.925e-02  -2.978 0.002903 ** 
GIVING_MAX_PLEDGE_MO5            -1.962e-01  8.749e-02  -2.243 0.024915 *  
GIVING_MAX_PLEDGE_MO6            -3.767e-01  9.013e-02  -4.179 2.93e-05 ***
GIVING_MAX_PLEDGE_MO7            -6.998e-02  1.112e-01  -0.629 0.529099    
GIVING_MAX_PLEDGE_MO8            -1.837e-01  9.768e-02  -1.880 0.060051 .  
GIVING_MAX_PLEDGE_MO9             1.065e-01  1.008e-01   1.056 0.290869    
GIVING_MAX_PLEDGE_MO10           -2.566e-01  8.657e-02  -2.964 0.003032 ** 
GIVING_MAX_PLEDGE_MO11           -2.027e-01  9.036e-02  -2.243 0.024880 *  
GIVING_MAX_PLEDGE_MO12           -2.048e-01  1.003e-01  -2.042 0.041189 *  
KSM_PROSPECTNo                   -1.250e-01  9.011e-02  -1.387 0.165381    
KSM_PROSPECTPast                 -1.586e-01  1.238e-01  -1.281 0.200051    
VISITORS_5FY                     -1.481e-02  2.882e-02  -0.514 0.607336    
LOYAL_5_PCT_CASH                  3.946e+00  8.421e-01   4.686 2.79e-06 ***
UPGRADE3_CASH-1                   2.256e-01  1.725e-01   1.308 0.190971    
UPGRADE3_CASH0                    7.132e-02  1.739e-01   0.410 0.681652    
UPGRADE3_CASH1                    4.819e-05  2.098e-01   0.000 0.999817    
UPGRADE3_CASH2                    1.936e-01  2.346e-01   0.825 0.409251    
VELOCITY3_CASH                   -2.512e-01  1.061e-01  -2.368 0.017872 *  
VELOCITY3_LIN_CASH                3.108e-02  2.848e-02   1.091 0.275133    
SPOUSE_ALUMTRUE                  -2.889e+01  1.482e+01  -1.950 0.051213 .  
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 46782  on 76095  degrees of freedom
Residual deviance: 23309  on 75981  degrees of freedom
AIC: 23539

Number of Fisher Scoring iterations: 9
summary(glm_standard, corr = TRUE)$correlation %>%
  data.frame() %>%
  plot_corrs()

Pretty eyewatering. Look at the term plots.

termplot(glm_standard)

Definitely keep:

  • Program group looks very interesting
  • Pref addr type code could be interesting
  • CRU giving segment looks very interesting too
  • Spouse alum or spouse KSM year, not both

Definitely drop:

  • Has Home Email
  • Gifts credit card
  • Gift clubs fields
  • KSM GOs flag
  • Evaluation and UOR
  • KSM prospect flag
  • KSM Events Reunions
  • Giving max pledge mo

Needs transformation:

  • Giving first year
  • Months assigned
  • Events prev 3 FY
  • Events CFY
  • Athletics ticket last
  • Record yr
  • Max cash year

Duplicative:

  • Giving first year pledge amt
  • Giving max cash amt
  • Giving AF total
  • Gifts outrights payments
  • CRU PFY1 through 5
  • Committees CFY and PFY 1-3
  • Events yrs and KSM events yrs
  • Velocity3 cash
  • Spouse first KSM year
glm_standard <- glm_standard %>% update(
  data = traindat %>% select(
    -HOUSEHOLD_ID
    , -RECORD_STATUS_CODE
    # Drop
    , -HAS_HOME_EMAIL
    , -GIFTS_CREDIT_CARD
    , -contains('GIFT_CLUB')
    , -KSM_GOS_FLAG
    , -EVALUATION_LOWER_BOUND
    , -UOR_LOWER_BOUND
    , -KSM_PROSPECT
    , -KSM_EVENTS_REUNIONS
    , -GIVING_MAX_PLEDGE_MO
    # Duplicative
    , -GIVING_FIRST_YEAR_PLEDGE_AMT
    , -GIVING_MAX_CASH_AMT
    , -GIVING_AF_TOTAL
    , -GIFTS_OUTRIGHTS_PAYMENTS
    , -contains('CRU_PFY')
    , -contains('COMMITTEES_')
    , -contains('EVENTS_YRS')
    , -VELOCITY3_CASH
    , -SPOUSE_FIRST_KSM_YEAR
  )
)
summary(glm_standard)

Call:
glm(formula = rv.gave ~ ., family = "binomial", data = traindat %>% 
    select(-HOUSEHOLD_ID, -RECORD_STATUS_CODE, -HAS_HOME_EMAIL, 
        -GIFTS_CREDIT_CARD, -contains("GIFT_CLUB"), -KSM_GOS_FLAG, 
        -EVALUATION_LOWER_BOUND, -UOR_LOWER_BOUND, -KSM_PROSPECT, 
        -KSM_EVENTS_REUNIONS, -GIVING_MAX_PLEDGE_MO, -GIVING_FIRST_YEAR_PLEDGE_AMT, 
        -GIVING_MAX_CASH_AMT, -GIVING_AF_TOTAL, -GIFTS_OUTRIGHTS_PAYMENTS, 
        -contains("CRU_PFY"), -contains("COMMITTEES_"), -contains("EVENTS_YRS"), 
        -VELOCITY3_CASH, -SPOUSE_FIRST_KSM_YEAR))

Deviance Residuals: 
    Min       1Q   Median       3Q      Max  
-2.8951  -0.2673  -0.1436  -0.0347   3.8464  

Coefficients:
                                   Estimate Std. Error z value Pr(>|z|)    
(Intercept)                      -8.419e+01  5.939e+00 -14.174  < 2e-16 ***
PROGRAM_GROUPNONE                -1.338e+00  1.182e-01 -11.319  < 2e-16 ***
PROGRAM_GROUPEMP                 -1.731e-01  5.886e-02  -2.941 0.003274 ** 
PROGRAM_GROUPEXECED              -3.104e+00  3.889e-01  -7.981 1.45e-15 ***
PROGRAM_GROUPNONGRD              -1.596e+00  5.221e-01  -3.057 0.002236 ** 
PROGRAM_GROUPPHD                  3.468e-02  2.058e-01   0.169 0.866170    
PROGRAM_GROUPTMP                 -2.917e-01  4.946e-02  -5.898 3.69e-09 ***
PREF_ADDR_TYPE_CODEALT           -5.028e-01  1.743e-01  -2.885 0.003918 ** 
PREF_ADDR_TYPE_CODEBUS           -1.564e-02  7.414e-02  -0.211 0.832919    
HOUSEHOLD_CONTINENT              -2.355e+00  1.490e-01 -15.802  < 2e-16 ***
HOUSEHOLD_CONTINENTAfrica        -2.200e+00  1.059e+00  -2.079 0.037658 *  
HOUSEHOLD_CONTINENTAsia          -3.379e-01  8.889e-02  -3.801 0.000144 ***
HOUSEHOLD_CONTINENTEurope        -9.721e-01  1.239e-01  -7.845 4.32e-15 ***
HOUSEHOLD_CONTINENTOceania       -1.377e+00  4.488e-01  -3.067 0.002159 ** 
HOUSEHOLD_CONTINENTSouth America -5.796e-01  1.755e-01  -3.302 0.000959 ***
BUS_IS_EMPLOYEDTRUE               3.331e-01  5.900e-02   5.645 1.65e-08 ***
HAS_HOME_ADDRTRUE                -1.572e-01  4.010e-02  -3.921 8.83e-05 ***
HAS_HOME_PHONETRUE               -4.160e-01  4.170e-02  -9.975  < 2e-16 ***
GIVING_FIRST_YEAR                 2.853e-03  3.664e-03   0.778 0.436284    
GIVING_FIRST_YEAR_CASH_AMT       -5.655e-02  2.418e-02  -2.339 0.019337 *  
GIVING_MAX_PLEDGE_AMT            -2.016e-01  4.864e-01  -0.414 0.678597    
GIVING_CASH_TOTAL                 5.296e-01  7.527e-02   7.036 1.98e-12 ***
GIVING_PLEDGE_TOTAL               6.126e-02  5.073e-01   0.121 0.903892    
GIVING_CRU_TOTAL                 -3.640e-01  7.006e-02  -5.195 2.05e-07 ***
GIFTS_ALLOCS_SUPPORTED            8.033e-02  2.182e-02   3.681 0.000232 ***
GIFTS_FYS_SUPPORTED               5.184e-02  7.605e-03   6.816 9.34e-12 ***
GIFTS_CASH                        9.161e-04  5.073e-03   0.181 0.856694    
GIFTS_PLEDGES                    -1.028e-01  7.436e-02  -1.383 0.166771    
CASH_PFY1                         2.226e-01  4.944e-02   4.502 6.73e-06 ***
CASH_PFY2                        -4.504e-02  3.477e-02  -1.296 0.195126    
CASH_PFY3                        -9.976e-03  3.557e-02  -0.280 0.779122    
CASH_PFY4                         2.323e-01  2.329e-02   9.974  < 2e-16 ***
CASH_PFY5                        -3.178e-01  6.238e-02  -5.095 3.50e-07 ***
CRU_GIVING_SEGMENTDonor          -3.948e+00  7.361e+00  -0.536 0.591754    
CRU_GIVING_SEGMENTLapsed         -5.277e+00  7.348e+00  -0.718 0.472691    
CRU_GIVING_SEGMENTLoyal 2 of 3   -3.406e+00  7.362e+00  -0.463 0.643658    
CRU_GIVING_SEGMENTLoyal 3+       -2.402e+00  7.365e+00  -0.326 0.744343    
CRU_GIVING_SEGMENTLYBUNT         -4.086e+00  7.361e+00  -0.555 0.578847    
CRU_GIVING_SEGMENTNon            -6.137e+00  7.348e+00  -0.835 0.403556    
CRU_GIVING_SEGMENTPYBUNT         -4.765e+00  7.356e+00  -0.648 0.517172    
MONTHS_ASSIGNED                  -3.554e-03  2.816e-03  -1.262 0.206826    
COMMITTEE_NU_DISTINCT             3.956e-03  2.844e-02   0.139 0.889351    
COMMITTEE_NU_YEARS                2.901e-02  1.682e-02   1.725 0.084600 .  
COMMITTEE_KSM_DISTINCT            6.049e-02  2.774e-02   2.181 0.029220 *  
EVENTS_PREV_3_FY                 -3.338e-02  2.614e-02  -1.277 0.201530    
KSM_EVENTS_PREV_3_FY             -1.045e-02  1.600e-02  -0.653 0.513713    
EVENTS_CFY                        6.143e-02  3.173e-02   1.936 0.052843 .  
EVENTS_PFY1                       6.426e-02  3.255e-02   1.974 0.048328 *  
ATHLETICS_TICKET_YEARS            1.607e-02  2.536e-02   0.634 0.526260    
ATHLETICS_TICKET_LAST            -6.974e-05  6.915e-05  -1.009 0.313192    
RECORD_YR                         1.326e-02  2.454e-03   5.406 6.44e-08 ***
GIVING_MAX_CASH_YR                2.701e-02  2.907e-03   9.293  < 2e-16 ***
GIVING_MAX_CASH_MO2              -1.571e-02  1.119e-01  -0.140 0.888337    
GIVING_MAX_CASH_MO3              -2.271e-02  1.036e-01  -0.219 0.826475    
GIVING_MAX_CASH_MO4              -7.325e-02  1.026e-01  -0.714 0.475058    
GIVING_MAX_CASH_MO5               6.974e-02  9.782e-02   0.713 0.475907    
GIVING_MAX_CASH_MO6              -1.621e-01  9.932e-02  -1.632 0.102736    
GIVING_MAX_CASH_MO7               4.317e-03  1.093e-01   0.040 0.968491    
GIVING_MAX_CASH_MO8               9.995e-03  9.708e-02   0.103 0.917992    
GIVING_MAX_CASH_MO9               8.731e-02  1.219e-01   0.716 0.473926    
GIVING_MAX_CASH_MO10              8.821e-02  1.141e-01   0.773 0.439596    
GIVING_MAX_CASH_MO11              4.664e-02  1.063e-01   0.439 0.660817    
GIVING_MAX_CASH_MO12              1.880e-01  9.136e-02   2.058 0.039569 *  
VISITORS_5FY                      1.076e-02  2.712e-02   0.397 0.691686    
LOYAL_5_PCT_CASH                  5.825e+00  7.635e-01   7.629 2.36e-14 ***
UPGRADE3_CASH-1                   1.850e-01  1.691e-01   1.094 0.273969    
UPGRADE3_CASH0                    7.754e-02  1.723e-01   0.450 0.652585    
UPGRADE3_CASH1                    1.043e-02  2.069e-01   0.050 0.959775    
UPGRADE3_CASH2                    2.263e-02  2.233e-01   0.101 0.919281    
VELOCITY3_LIN_CASH                2.131e-02  2.796e-02   0.762 0.445873    
SPOUSE_ALUMTRUE                   3.334e-01  8.541e-02   3.903 9.50e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 46782  on 76095  degrees of freedom
Residual deviance: 23539  on 76025  degrees of freedom
AIC: 23681

Number of Fisher Scoring iterations: 9

The AIC is higher, but comparable.

Logistic regression with splines

dfs <- 4

Now introduce splines on the numeric variables, arbitrarily setting df = 4.

glm_st_splines <- glm(
  rv.gave ~
    PROGRAM_GROUP +
    PREF_ADDR_TYPE_CODE +
    HOUSEHOLD_CONTINENT +
    BUS_IS_EMPLOYED +
    HAS_HOME_ADDR +
    HAS_HOME_PHONE +
    ns(YEARS_SINCE_FIRST_GIFT, df = dfs) +
    ns(GIVING_FIRST_YEAR_CASH_AMT, df = dfs) +
    ns(GIVING_MAX_PLEDGE_AMT, df = dfs) +
    ns(GIVING_CASH_TOTAL, df = dfs) +
    ns(GIVING_PLEDGE_TOTAL, df = dfs) +
    ns(GIVING_CRU_TOTAL, df = dfs) +
    ns(GIFTS_ALLOCS_SUPPORTED, df = dfs) +
    ns(GIFTS_FYS_SUPPORTED, df = dfs) +
    ns(GIFTS_CASH, df = dfs) +
    ns(GIFTS_PLEDGES, df = dfs) +
    ns(CASH_PFY1, df = dfs) +
    ns(CASH_PFY2, df = dfs) +
    ns(CASH_PFY3, df = dfs) +
    ns(CASH_PFY4, df = dfs) +
    ns(CASH_PFY5, df = dfs) +
    CRU_GIVING_SEGMENT +
    ns(EVALUATION_LOWER_BOUND, df = dfs) +
    ns(UOR_LOWER_BOUND, df = dfs) +
    ns(MONTHS_ASSIGNED, df = dfs) +
    ns(COMMITTEE_NU_DISTINCT, df = dfs) +
    ns(COMMITTEE_NU_YEARS, df = dfs) +
    ns(COMMITTEE_KSM_DISTINCT, df = dfs) +
    ns(EVENTS_PREV_3_FY, df = dfs) +
    ns(EVENTS_CFY, df = dfs) +
    ns(EVENTS_PFY1, df = dfs) +
    ns(ATHLETICS_TICKET_YEARS, df = dfs) +
    ns(YEARS_SINCE_ATHLETICS_TICKETS, df = dfs) +
    ns(RECORD_YR, df = dfs) +
    ns(YEARS_SINCE_MAX_CASH_YR, df = dfs) +
    GIVING_MAX_CASH_MO +
    KSM_PROSPECT +
    ns(VISITORS_5FY, df = dfs) +
    LOYAL_5_PCT_CASH +
    UPGRADE3_CASH +
    VELOCITY3_LIN_CASH +
    SPOUSE_ALUM
  , data = traindat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_ATHLETICS_TICKETS = 2016 - ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
  , family = 'binomial'
)
summary(glm_st_splines)

Call:
glm(formula = rv.gave ~ PROGRAM_GROUP + PREF_ADDR_TYPE_CODE + 
    HOUSEHOLD_CONTINENT + BUS_IS_EMPLOYED + HAS_HOME_ADDR + HAS_HOME_PHONE + 
    ns(YEARS_SINCE_FIRST_GIFT, df = dfs) + ns(GIVING_FIRST_YEAR_CASH_AMT, 
    df = dfs) + ns(GIVING_MAX_PLEDGE_AMT, df = dfs) + ns(GIVING_CASH_TOTAL, 
    df = dfs) + ns(GIVING_PLEDGE_TOTAL, df = dfs) + ns(GIVING_CRU_TOTAL, 
    df = dfs) + ns(GIFTS_ALLOCS_SUPPORTED, df = dfs) + ns(GIFTS_FYS_SUPPORTED, 
    df = dfs) + ns(GIFTS_CASH, df = dfs) + ns(GIFTS_PLEDGES, 
    df = dfs) + ns(CASH_PFY1, df = dfs) + ns(CASH_PFY2, df = dfs) + 
    ns(CASH_PFY3, df = dfs) + ns(CASH_PFY4, df = dfs) + ns(CASH_PFY5, 
    df = dfs) + CRU_GIVING_SEGMENT + ns(EVALUATION_LOWER_BOUND, 
    df = dfs) + ns(UOR_LOWER_BOUND, df = dfs) + ns(MONTHS_ASSIGNED, 
    df = dfs) + ns(COMMITTEE_NU_DISTINCT, df = dfs) + ns(COMMITTEE_NU_YEARS, 
    df = dfs) + ns(COMMITTEE_KSM_DISTINCT, df = dfs) + ns(EVENTS_PREV_3_FY, 
    df = dfs) + ns(EVENTS_CFY, df = dfs) + ns(EVENTS_PFY1, df = dfs) + 
    ns(ATHLETICS_TICKET_YEARS, df = dfs) + ns(YEARS_SINCE_ATHLETICS_TICKETS, 
    df = dfs) + ns(RECORD_YR, df = dfs) + ns(YEARS_SINCE_MAX_CASH_YR, 
    df = dfs) + GIVING_MAX_CASH_MO + KSM_PROSPECT + ns(VISITORS_5FY, 
    df = dfs) + LOYAL_5_PCT_CASH + UPGRADE3_CASH + VELOCITY3_LIN_CASH + 
    SPOUSE_ALUM, family = "binomial", data = traindat %>% mutate(YEARS_SINCE_FIRST_GIFT = 2016 - 
    ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017), YEARS_SINCE_ATHLETICS_TICKETS = 2016 - 
    ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 
        2017), YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 
    0, GIVING_MAX_CASH_YR, 2017)))

Deviance Residuals: 
    Min       1Q   Median       3Q      Max  
-2.9223  -0.2695  -0.1453  -0.0317   3.9149  

Coefficients: (71 not defined because of singularities)
                                              Estimate Std. Error z value Pr(>|z|)    
(Intercept)                                   1.691519   3.223131   0.525 0.599718    
PROGRAM_GROUPNONE                            -1.307533   0.121008 -10.805  < 2e-16 ***
PROGRAM_GROUPEMP                             -0.161109   0.059800  -2.694 0.007057 ** 
PROGRAM_GROUPEXECED                          -3.127629   0.389833  -8.023 1.03e-15 ***
PROGRAM_GROUPNONGRD                          -1.719495   0.563736  -3.050 0.002287 ** 
PROGRAM_GROUPPHD                              0.021555   0.206089   0.105 0.916700    
PROGRAM_GROUPTMP                             -0.298704   0.050454  -5.920 3.21e-09 ***
PREF_ADDR_TYPE_CODEALT                       -0.456107   0.175104  -2.605 0.009193 ** 
PREF_ADDR_TYPE_CODEBUS                        0.003857   0.073975   0.052 0.958424    
HOUSEHOLD_CONTINENT                          -2.217280   0.154429 -14.358  < 2e-16 ***
HOUSEHOLD_CONTINENTAfrica                    -2.204274   1.064301  -2.071 0.038349 *  
HOUSEHOLD_CONTINENTAsia                      -0.298478   0.088878  -3.358 0.000784 ***
HOUSEHOLD_CONTINENTEurope                    -0.932184   0.124519  -7.486 7.09e-14 ***
HOUSEHOLD_CONTINENTOceania                   -1.424400   0.455825  -3.125 0.001779 ** 
HOUSEHOLD_CONTINENTSouth America             -0.531665   0.175506  -3.029 0.002451 ** 
BUS_IS_EMPLOYEDTRUE                           0.296278   0.060620   4.887 1.02e-06 ***
HAS_HOME_ADDRTRUE                            -0.165690   0.040389  -4.102 4.09e-05 ***
HAS_HOME_PHONETRUE                           -0.418747   0.041920  -9.989  < 2e-16 ***
ns(YEARS_SINCE_FIRST_GIFT, df = dfs)1         1.426763   0.393234   3.628 0.000285 ***
ns(YEARS_SINCE_FIRST_GIFT, df = dfs)2         1.580360   0.268025   5.896 3.72e-09 ***
ns(YEARS_SINCE_FIRST_GIFT, df = dfs)3               NA         NA      NA       NA    
ns(YEARS_SINCE_FIRST_GIFT, df = dfs)4               NA         NA      NA       NA    
ns(GIVING_FIRST_YEAR_CASH_AMT, df = dfs)1    -0.899549   0.828477  -1.086 0.277573    
ns(GIVING_FIRST_YEAR_CASH_AMT, df = dfs)2    -0.976102   0.637153  -1.532 0.125529    
ns(GIVING_FIRST_YEAR_CASH_AMT, df = dfs)3           NA         NA      NA       NA    
ns(GIVING_FIRST_YEAR_CASH_AMT, df = dfs)4           NA         NA      NA       NA    
ns(GIVING_MAX_PLEDGE_AMT, df = dfs)1          3.743279   3.808069   0.983 0.325614    
ns(GIVING_MAX_PLEDGE_AMT, df = dfs)2                NA         NA      NA       NA    
ns(GIVING_MAX_PLEDGE_AMT, df = dfs)3                NA         NA      NA       NA    
ns(GIVING_MAX_PLEDGE_AMT, df = dfs)4                NA         NA      NA       NA    
ns(GIVING_CASH_TOTAL, df = dfs)1             -3.816384   1.166911  -3.271 0.001074 ** 
ns(GIVING_CASH_TOTAL, df = dfs)2              0.716513   0.810228   0.884 0.376516    
ns(GIVING_CASH_TOTAL, df = dfs)3                    NA         NA      NA       NA    
ns(GIVING_CASH_TOTAL, df = dfs)4                    NA         NA      NA       NA    
ns(GIVING_PLEDGE_TOTAL, df = dfs)1           -2.776750   4.026394  -0.690 0.490423    
ns(GIVING_PLEDGE_TOTAL, df = dfs)2                  NA         NA      NA       NA    
ns(GIVING_PLEDGE_TOTAL, df = dfs)3                  NA         NA      NA       NA    
ns(GIVING_PLEDGE_TOTAL, df = dfs)4                  NA         NA      NA       NA    
ns(GIVING_CRU_TOTAL, df = dfs)1               5.198087   0.904969   5.744 9.25e-09 ***
ns(GIVING_CRU_TOTAL, df = dfs)2               2.821611   0.790900   3.568 0.000360 ***
ns(GIVING_CRU_TOTAL, df = dfs)3                     NA         NA      NA       NA    
ns(GIVING_CRU_TOTAL, df = dfs)4                     NA         NA      NA       NA    
ns(GIFTS_ALLOCS_SUPPORTED, df = dfs)1        -1.338855   1.105541  -1.211 0.225880    
ns(GIFTS_ALLOCS_SUPPORTED, df = dfs)2         0.202803   1.094022   0.185 0.852936    
ns(GIFTS_ALLOCS_SUPPORTED, df = dfs)3               NA         NA      NA       NA    
ns(GIFTS_ALLOCS_SUPPORTED, df = dfs)4               NA         NA      NA       NA    
ns(GIFTS_FYS_SUPPORTED, df = dfs)1           -4.272014   0.561592  -7.607 2.81e-14 ***
ns(GIFTS_FYS_SUPPORTED, df = dfs)2           -1.017990   0.358445  -2.840 0.004511 ** 
ns(GIFTS_FYS_SUPPORTED, df = dfs)3                  NA         NA      NA       NA    
ns(GIFTS_FYS_SUPPORTED, df = dfs)4                  NA         NA      NA       NA    
ns(GIFTS_CASH, df = dfs)1                    -5.097566   4.160092  -1.225 0.220444    
ns(GIFTS_CASH, df = dfs)2                    -3.498484   3.546673  -0.986 0.323931    
ns(GIFTS_CASH, df = dfs)3                           NA         NA      NA       NA    
ns(GIFTS_CASH, df = dfs)4                           NA         NA      NA       NA    
ns(GIFTS_PLEDGES, df = dfs)1                  2.057330   0.829133   2.481 0.013090 *  
ns(GIFTS_PLEDGES, df = dfs)2                        NA         NA      NA       NA    
ns(GIFTS_PLEDGES, df = dfs)3                        NA         NA      NA       NA    
ns(GIFTS_PLEDGES, df = dfs)4                        NA         NA      NA       NA    
ns(CASH_PFY1, df = dfs)1                     -2.103193   0.356799  -5.895 3.76e-09 ***
ns(CASH_PFY1, df = dfs)2                            NA         NA      NA       NA    
ns(CASH_PFY1, df = dfs)3                            NA         NA      NA       NA    
ns(CASH_PFY1, df = dfs)4                            NA         NA      NA       NA    
ns(CASH_PFY2, df = dfs)1                     -0.065122   0.277359  -0.235 0.814370    
ns(CASH_PFY2, df = dfs)2                            NA         NA      NA       NA    
ns(CASH_PFY2, df = dfs)3                            NA         NA      NA       NA    
ns(CASH_PFY2, df = dfs)4                            NA         NA      NA       NA    
ns(CASH_PFY3, df = dfs)1                     -0.311056   0.265752  -1.170 0.241810    
ns(CASH_PFY3, df = dfs)2                            NA         NA      NA       NA    
ns(CASH_PFY3, df = dfs)3                            NA         NA      NA       NA    
ns(CASH_PFY3, df = dfs)4                            NA         NA      NA       NA    
ns(CASH_PFY4, df = dfs)1                     -1.652616   0.172823  -9.562  < 2e-16 ***
ns(CASH_PFY4, df = dfs)2                            NA         NA      NA       NA    
ns(CASH_PFY4, df = dfs)3                            NA         NA      NA       NA    
ns(CASH_PFY4, df = dfs)4                            NA         NA      NA       NA    
ns(CASH_PFY5, df = dfs)1                      1.257206   0.534248   2.353 0.018611 *  
ns(CASH_PFY5, df = dfs)2                            NA         NA      NA       NA    
ns(CASH_PFY5, df = dfs)3                            NA         NA      NA       NA    
ns(CASH_PFY5, df = dfs)4                            NA         NA      NA       NA    
CRU_GIVING_SEGMENTDonor                       0.798294   0.235017   3.397 0.000682 ***
CRU_GIVING_SEGMENTLapsed                     -0.551629   0.207531  -2.658 0.007859 ** 
CRU_GIVING_SEGMENTLoyal 2 of 3                1.189120   0.225871   5.265 1.40e-07 ***
CRU_GIVING_SEGMENTLoyal 3+                    2.048346   0.251541   8.143 3.85e-16 ***
CRU_GIVING_SEGMENTLYBUNT                      0.630074   0.223302   2.822 0.004778 ** 
CRU_GIVING_SEGMENTNon                        -0.706040   0.362783  -1.946 0.051633 .  
CRU_GIVING_SEGMENTPYBUNT                      0.038088   0.207834   0.183 0.854593    
ns(EVALUATION_LOWER_BOUND, df = dfs)1         0.000696   0.121294   0.006 0.995422    
ns(EVALUATION_LOWER_BOUND, df = dfs)2               NA         NA      NA       NA    
ns(EVALUATION_LOWER_BOUND, df = dfs)3               NA         NA      NA       NA    
ns(EVALUATION_LOWER_BOUND, df = dfs)4               NA         NA      NA       NA    
ns(UOR_LOWER_BOUND, df = dfs)1               -0.141311   0.169779  -0.832 0.405225    
ns(UOR_LOWER_BOUND, df = dfs)2                      NA         NA      NA       NA    
ns(UOR_LOWER_BOUND, df = dfs)3                      NA         NA      NA       NA    
ns(UOR_LOWER_BOUND, df = dfs)4                      NA         NA      NA       NA    
ns(MONTHS_ASSIGNED, df = dfs)1                0.304049   0.570940   0.533 0.594352    
ns(MONTHS_ASSIGNED, df = dfs)2                      NA         NA      NA       NA    
ns(MONTHS_ASSIGNED, df = dfs)3                      NA         NA      NA       NA    
ns(MONTHS_ASSIGNED, df = dfs)4                      NA         NA      NA       NA    
ns(COMMITTEE_NU_DISTINCT, df = dfs)1         -0.653461   2.072880  -0.315 0.752577    
ns(COMMITTEE_NU_DISTINCT, df = dfs)2          0.403521   1.913680   0.211 0.832995    
ns(COMMITTEE_NU_DISTINCT, df = dfs)3                NA         NA      NA       NA    
ns(COMMITTEE_NU_DISTINCT, df = dfs)4                NA         NA      NA       NA    
ns(COMMITTEE_NU_YEARS, df = dfs)1             0.221676   0.988885   0.224 0.822627    
ns(COMMITTEE_NU_YEARS, df = dfs)2             0.863657   1.029639   0.839 0.401584    
ns(COMMITTEE_NU_YEARS, df = dfs)3                   NA         NA      NA       NA    
ns(COMMITTEE_NU_YEARS, df = dfs)4                   NA         NA      NA       NA    
ns(COMMITTEE_KSM_DISTINCT, df = dfs)1        -1.970115   1.212583  -1.625 0.104221    
ns(COMMITTEE_KSM_DISTINCT, df = dfs)2        -1.599907   1.038235  -1.541 0.123320    
ns(COMMITTEE_KSM_DISTINCT, df = dfs)3               NA         NA      NA       NA    
ns(COMMITTEE_KSM_DISTINCT, df = dfs)4               NA         NA      NA       NA    
ns(EVENTS_PREV_3_FY, df = dfs)1               3.633802   3.436981   1.057 0.290390    
ns(EVENTS_PREV_3_FY, df = dfs)2                     NA         NA      NA       NA    
ns(EVENTS_PREV_3_FY, df = dfs)3                     NA         NA      NA       NA    
ns(EVENTS_PREV_3_FY, df = dfs)4                     NA         NA      NA       NA    
ns(EVENTS_CFY, df = dfs)1                    -2.280573   1.479784  -1.541 0.123280    
ns(EVENTS_CFY, df = dfs)2                           NA         NA      NA       NA    
ns(EVENTS_CFY, df = dfs)3                           NA         NA      NA       NA    
ns(EVENTS_CFY, df = dfs)4                           NA         NA      NA       NA    
ns(EVENTS_PFY1, df = dfs)1                   -3.165687   1.775252  -1.783 0.074549 .  
ns(EVENTS_PFY1, df = dfs)2                          NA         NA      NA       NA    
ns(EVENTS_PFY1, df = dfs)3                          NA         NA      NA       NA    
ns(EVENTS_PFY1, df = dfs)4                          NA         NA      NA       NA    
ns(ATHLETICS_TICKET_YEARS, df = dfs)1        -0.027763   0.214692  -0.129 0.897108    
ns(ATHLETICS_TICKET_YEARS, df = dfs)2               NA         NA      NA       NA    
ns(ATHLETICS_TICKET_YEARS, df = dfs)3               NA         NA      NA       NA    
ns(ATHLETICS_TICKET_YEARS, df = dfs)4               NA         NA      NA       NA    
ns(YEARS_SINCE_ATHLETICS_TICKETS, df = dfs)1  0.095205   0.310646   0.306 0.759244    
ns(YEARS_SINCE_ATHLETICS_TICKETS, df = dfs)2        NA         NA      NA       NA    
ns(YEARS_SINCE_ATHLETICS_TICKETS, df = dfs)3        NA         NA      NA       NA    
ns(YEARS_SINCE_ATHLETICS_TICKETS, df = dfs)4        NA         NA      NA       NA    
ns(RECORD_YR, df = dfs)1                      2.288420   0.847561   2.700 0.006934 ** 
ns(RECORD_YR, df = dfs)2                      1.731401   0.605119   2.861 0.004220 ** 
ns(RECORD_YR, df = dfs)3                      5.267373   1.838442   2.865 0.004168 ** 
ns(RECORD_YR, df = dfs)4                      1.452452   0.302687   4.799 1.60e-06 ***
ns(YEARS_SINCE_MAX_CASH_YR, df = dfs)1       -0.433171   0.118762  -3.647 0.000265 ***
ns(YEARS_SINCE_MAX_CASH_YR, df = dfs)2       -0.778818   0.410460  -1.897 0.057771 .  
ns(YEARS_SINCE_MAX_CASH_YR, df = dfs)3       -4.254386   1.052326  -4.043 5.28e-05 ***
ns(YEARS_SINCE_MAX_CASH_YR, df = dfs)4       -7.094770   2.126671  -3.336 0.000850 ***
GIVING_MAX_CASH_MO2                          -0.021552   0.112346  -0.192 0.847870    
GIVING_MAX_CASH_MO3                          -0.018255   0.103821  -0.176 0.860429    
GIVING_MAX_CASH_MO4                          -0.054266   0.103015  -0.527 0.598348    
GIVING_MAX_CASH_MO5                           0.111024   0.098181   1.131 0.258134    
GIVING_MAX_CASH_MO6                          -0.092274   0.099961  -0.923 0.355956    
GIVING_MAX_CASH_MO7                           0.025998   0.109582   0.237 0.812464    
GIVING_MAX_CASH_MO8                           0.052642   0.097686   0.539 0.589964    
GIVING_MAX_CASH_MO9                           0.114851   0.122398   0.938 0.348066    
GIVING_MAX_CASH_MO10                          0.109361   0.114806   0.953 0.340807    
GIVING_MAX_CASH_MO11                          0.027763   0.106798   0.260 0.794895    
GIVING_MAX_CASH_MO12                          0.186771   0.091782   2.035 0.041857 *  
KSM_PROSPECTNo                               -0.149850   0.089256  -1.679 0.093176 .  
KSM_PROSPECTPast                             -0.096806   0.123150  -0.786 0.431819    
ns(VISITORS_5FY, df = dfs)1                  -0.405392   0.752794  -0.539 0.590220    
ns(VISITORS_5FY, df = dfs)2                         NA         NA      NA       NA    
ns(VISITORS_5FY, df = dfs)3                         NA         NA      NA       NA    
ns(VISITORS_5FY, df = dfs)4                         NA         NA      NA       NA    
LOYAL_5_PCT_CASH                              3.772261   0.818488   4.609 4.05e-06 ***
UPGRADE3_CASH-1                               0.134585   0.169585   0.794 0.427421    
UPGRADE3_CASH0                                0.113803   0.172890   0.658 0.510386    
UPGRADE3_CASH1                                0.042539   0.208485   0.204 0.838323    
UPGRADE3_CASH2                                0.079741   0.225502   0.354 0.723627    
VELOCITY3_LIN_CASH                            0.009478   0.027977   0.339 0.734766    
SPOUSE_ALUMTRUE                               0.322650   0.085743   3.763 0.000168 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 46782  on 76095  degrees of freedom
Residual deviance: 23419  on 76006  degrees of freedom
AIC: 23599

Number of Fisher Scoring iterations: 10
termplot(glm_st_splines)

Some more thoughts.

  • Don’t put splines on the already-transformed giving variables
  • Consider the standard square root variance stabilizing transformation for counts
  • Try using “years since last (behavior) year”
glm_st_splines <- glm(
  rv.gave ~
    PROGRAM_GROUP +
    PREF_ADDR_TYPE_CODE +
    HOUSEHOLD_CONTINENT +
    BUS_IS_EMPLOYED +
    HAS_HOME_ADDR +
    HAS_HOME_PHONE +
    # ns(YEARS_SINCE_FIRST_GIFT, 2) +
    # GIVING_FIRST_YEAR_CASH_AMT +
    # GIVING_MAX_PLEDGE_AMT +
    GIVING_CASH_TOTAL +
    # GIVING_PLEDGE_TOTAL +
    # GIVING_CRU_TOTAL +
    # sqrt(GIFTS_ALLOCS_SUPPORTED) +
    sqrt(GIFTS_FYS_SUPPORTED) +
    # sqrt(GIFTS_CASH) +
    sqrt(GIFTS_PLEDGES) +
    CASH_PFY1 +
    CASH_PFY2 +
    CASH_PFY3 +
    CASH_PFY4 +
    CASH_PFY5 +
    CRU_GIVING_SEGMENT +
    # EVALUATION_LOWER_BOUND +
    # UOR_LOWER_BOUND +
    # sqrt(MONTHS_ASSIGNED) +
    # sqrt(COMMITTEE_NU_DISTINCT) +
    # sqrt(COMMITTEE_NU_YEARS) +
    # sqrt(COMMITTEE_KSM_DISTINCT) +
    # sqrt(EVENTS_PREV_3_FY) +
    sqrt(EVENTS_CFY) +
    # sqrt(EVENTS_PFY1) +
    # sqrt(ATHLETICS_TICKET_YEARS) +
    # YEARS_SINCE_ATHLETICS_TICKETS +
    ns(RECORD_YR, df = 5) +
    YEARS_SINCE_MAX_CASH_YR +
    GIVING_MAX_CASH_MO +
    # KSM_PROSPECT +
    # sqrt(VISITORS_5FY) +
    LOYAL_5_PCT_CASH +
    # UPGRADE3_CASH +
    # VELOCITY3_LIN_CASH +
    SPOUSE_ALUM
  , data = traindat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
  , family = 'binomial'
)
summary(glm_st_splines)

Call:
glm(formula = rv.gave ~ PROGRAM_GROUP + PREF_ADDR_TYPE_CODE + 
    HOUSEHOLD_CONTINENT + BUS_IS_EMPLOYED + HAS_HOME_ADDR + HAS_HOME_PHONE + 
    GIVING_CASH_TOTAL + sqrt(GIFTS_FYS_SUPPORTED) + sqrt(GIFTS_PLEDGES) + 
    CASH_PFY1 + CASH_PFY2 + CASH_PFY3 + CASH_PFY4 + CASH_PFY5 + 
    CRU_GIVING_SEGMENT + sqrt(EVENTS_CFY) + ns(RECORD_YR, df = 5) + 
    YEARS_SINCE_MAX_CASH_YR + GIVING_MAX_CASH_MO + LOYAL_5_PCT_CASH + 
    SPOUSE_ALUM, family = "binomial", data = traindat %>% mutate(YEARS_SINCE_FIRST_GIFT = 2016 - 
    ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017), YEARS_SINCE_MAX_CASH_YR = 2016 - 
    ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)))

Deviance Residuals: 
    Min       1Q   Median       3Q      Max  
-2.7695  -0.2668  -0.1427  -0.0356   3.7933  

Coefficients:
                                  Estimate Std. Error z value Pr(>|z|)    
(Intercept)                      -7.884909   1.256757  -6.274 3.52e-10 ***
PROGRAM_GROUPNONE                -1.348272   0.113552 -11.874  < 2e-16 ***
PROGRAM_GROUPEMP                 -0.218890   0.057401  -3.813 0.000137 ***
PROGRAM_GROUPEXECED              -3.188161   0.390359  -8.167 3.15e-16 ***
PROGRAM_GROUPNONGRD              -1.645957   0.505930  -3.253 0.001141 ** 
PROGRAM_GROUPPHD                 -0.002408   0.205027  -0.012 0.990628    
PROGRAM_GROUPTMP                 -0.328288   0.048848  -6.721 1.81e-11 ***
PREF_ADDR_TYPE_CODEALT           -0.474587   0.173100  -2.742 0.006112 ** 
PREF_ADDR_TYPE_CODEBUS           -0.012150   0.073983  -0.164 0.869555    
HOUSEHOLD_CONTINENT              -2.224402   0.152525 -14.584  < 2e-16 ***
HOUSEHOLD_CONTINENTAfrica        -2.125180   1.058783  -2.007 0.044729 *  
HOUSEHOLD_CONTINENTAsia          -0.278599   0.088339  -3.154 0.001612 ** 
HOUSEHOLD_CONTINENTEurope        -0.930010   0.123369  -7.538 4.76e-14 ***
HOUSEHOLD_CONTINENTOceania       -1.299472   0.451479  -2.878 0.003999 ** 
HOUSEHOLD_CONTINENTSouth America -0.511160   0.174757  -2.925 0.003445 ** 
BUS_IS_EMPLOYEDTRUE               0.362305   0.060352   6.003 1.94e-09 ***
HAS_HOME_ADDRTRUE                -0.167598   0.040203  -4.169 3.06e-05 ***
HAS_HOME_PHONETRUE               -0.409968   0.041748  -9.820  < 2e-16 ***
GIVING_CASH_TOTAL                 0.083497   0.041599   2.007 0.044726 *  
sqrt(GIFTS_FYS_SUPPORTED)         0.441189   0.031399  14.051  < 2e-16 ***
sqrt(GIFTS_PLEDGES)              -0.349652   0.038912  -8.986  < 2e-16 ***
CASH_PFY1                         0.242021   0.030553   7.921 2.35e-15 ***
CASH_PFY2                        -0.044281   0.031712  -1.396 0.162619    
CASH_PFY3                         0.021450   0.023286   0.921 0.356963    
CASH_PFY4                         0.225103   0.020043  11.231  < 2e-16 ***
CASH_PFY5                        -0.311989   0.062847  -4.964 6.90e-07 ***
CRU_GIVING_SEGMENTDonor           1.360228   0.126125  10.785  < 2e-16 ***
CRU_GIVING_SEGMENTLapsed          0.112962   0.111556   1.013 0.311249    
CRU_GIVING_SEGMENTLoyal 2 of 3    1.835777   0.125408  14.638  < 2e-16 ***
CRU_GIVING_SEGMENTLoyal 3+        2.777647   0.153166  18.135  < 2e-16 ***
CRU_GIVING_SEGMENTLYBUNT          1.264283   0.135446   9.334  < 2e-16 ***
CRU_GIVING_SEGMENTNon             0.140704   0.123937   1.135 0.256256    
CRU_GIVING_SEGMENTPYBUNT          0.634091   0.114802   5.523 3.33e-08 ***
sqrt(EVENTS_CFY)                  0.147177   0.026535   5.547 2.91e-08 ***
ns(RECORD_YR, df = 5)1            4.063062   1.200700   3.384 0.000715 ***
ns(RECORD_YR, df = 5)2            5.005408   1.272925   3.932 8.42e-05 ***
ns(RECORD_YR, df = 5)3            3.368826   0.838618   4.017 5.89e-05 ***
ns(RECORD_YR, df = 5)4            8.969274   2.524985   3.552 0.000382 ***
ns(RECORD_YR, df = 5)5            2.255912   0.415268   5.432 5.56e-08 ***
YEARS_SINCE_MAX_CASH_YR          -0.024679   0.002933  -8.414  < 2e-16 ***
GIVING_MAX_CASH_MO2              -0.007682   0.111631  -0.069 0.945137    
GIVING_MAX_CASH_MO3              -0.023679   0.103255  -0.229 0.818617    
GIVING_MAX_CASH_MO4              -0.062521   0.102225  -0.612 0.540800    
GIVING_MAX_CASH_MO5               0.093697   0.097415   0.962 0.336134    
GIVING_MAX_CASH_MO6              -0.155727   0.099125  -1.571 0.116179    
GIVING_MAX_CASH_MO7               0.015812   0.108995   0.145 0.884651    
GIVING_MAX_CASH_MO8               0.017199   0.096831   0.178 0.859022    
GIVING_MAX_CASH_MO9               0.103307   0.121796   0.848 0.396327    
GIVING_MAX_CASH_MO10              0.090505   0.113706   0.796 0.426056    
GIVING_MAX_CASH_MO11              0.040718   0.105975   0.384 0.700812    
GIVING_MAX_CASH_MO12              0.188005   0.091057   2.065 0.038952 *  
LOYAL_5_PCT_CASH                  5.758739   0.771286   7.466 8.24e-14 ***
SPOUSE_ALUMTRUE                   0.401725   0.083494   4.811 1.50e-06 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 46782  on 76095  degrees of freedom
Residual deviance: 23592  on 76043  degrees of freedom
AIC: 23698

Number of Fisher Scoring iterations: 9

Again, similar AIC.

Penalized logistic regression, dropped variables

Fit a logistic regression model with the ridge penalizer using the same subset of variables chosen in the previous step.

glm_ridge_cv <- cv.glmnet(
  rv.gave ~
    PROGRAM_GROUP +
    PREF_ADDR_TYPE_CODE +
    HOUSEHOLD_CONTINENT +
    BUS_IS_EMPLOYED +
    HAS_HOME_ADDR +
    HAS_HOME_PHONE +
    # ns(YEARS_SINCE_FIRST_GIFT, 2) +
    # GIVING_FIRST_YEAR_CASH_AMT +
    # GIVING_MAX_PLEDGE_AMT +
    GIVING_CASH_TOTAL +
    # GIVING_PLEDGE_TOTAL +
    # GIVING_CRU_TOTAL +
    # sqrt(GIFTS_ALLOCS_SUPPORTED) +
    sqrt(GIFTS_FYS_SUPPORTED) +
    # sqrt(GIFTS_CASH) +
    sqrt(GIFTS_PLEDGES) +
    CASH_PFY1 +
    CASH_PFY2 +
    CASH_PFY3 +
    CASH_PFY4 +
    CASH_PFY5 +
    CRU_GIVING_SEGMENT +
    # EVALUATION_LOWER_BOUND +
    # UOR_LOWER_BOUND +
    # sqrt(MONTHS_ASSIGNED) +
    # sqrt(COMMITTEE_NU_DISTINCT) +
    # sqrt(COMMITTEE_NU_YEARS) +
    # sqrt(COMMITTEE_KSM_DISTINCT) +
    # sqrt(EVENTS_PREV_3_FY) +
    sqrt(EVENTS_CFY) +
    # sqrt(EVENTS_PFY1) +
    # sqrt(ATHLETICS_TICKET_YEARS) +
    # YEARS_SINCE_ATHLETICS_TICKETS +
    ns(RECORD_YR, df = 5) +
    YEARS_SINCE_MAX_CASH_YR +
    GIVING_MAX_CASH_MO +
    # KSM_PROSPECT +
    # sqrt(VISITORS_5FY) +
    LOYAL_5_PCT_CASH +
    # UPGRADE3_CASH +
    # VELOCITY3_LIN_CASH +
    SPOUSE_ALUM
  , data = traindat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_ATHLETICS_TICKETS = 2016 - ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
  , family = 'binomial'
  , alpha = 0 # Ridge penalty
)

Compare coefficients between the penalized and unpenalized models.

full_join(
    data.frame(var = coef(glm_st_splines) %>% names(), unpenalized = coef(glm_st_splines))
  , data.frame(var = coef(glm_ridge_cv)[, 1] %>% names(), shrinkage = coef(glm_ridge_cv)[, 1])
  , by = c('var', 'var')
) %>% gather(model, 'coefficient', 2:3) %>%
  na.omit() %>%
  arrange(abs(coefficient) %>% desc()) %>%
  ggplot(aes(x = var %>% reorder(-abs(coefficient)), y = coefficient, color = model)) +
  geom_hline(yintercept = 0, color = 'darkgray') +
  geom_point(alpha = .5) +
  scale_y_continuous(trans = 'neg_sqrt', breaks = c(-50, -40, -30, seq(-20, 20, by = 5), -2, -.5, .5, 2)) +
  theme(axis.text.x = element_text(angle = 90, hjust = 1, vjust = .3)
            , panel.grid.minor = element_line(linetype = 'dotted')) +
  labs(x = 'var')

The ridge penalty leads to fairly aggressive coefficient shrinkage.

Comparison

# Holdout data with new variables
holdout_new <- holdoutdat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_ATHLETICS_TICKETS = 2016 - ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
# Threshold
theta1 <- sum(traindat$rv.gave) / nrow(traindat)
# Calculations
tmp.ns <- conf_matrix(glm_standard, newdata = holdoutdat, threshold = theta1)
tmp.s <- conf_matrix(glm_st_splines, newdata = holdout_new, threshold = theta1)
tmp.rs <- conf_matrix_glmnet(glm_ridge_cv, newdata = holdout_new, rv = 'rv.gave', threshold = theta1)
# Data frame
model_compare <- cbind(
  glm_baseline_err
  , glm_nospline = c(tmp.ns$err, tmp.ns$prec, tmp.ns$sens, tmp.ns$F1)
  , glm_spline = c(tmp.s$err, tmp.s$prec, tmp.s$sens, tmp.ns$F1)
  , glm_ridge = c(tmp.rs$err, tmp.rs$prec, tmp.rs$sens, tmp.rs$F1)
)
remove(tmp.ns, tmp.s, tmp.rs)
print(model_compare)

With threshold \(\theta =\) 0.092 the glm_ridge model is the winner.

# Calculations
tmp.ns <- conf_matrix(glm_standard, newdata = holdoutdat)
tmp.s <- conf_matrix(glm_st_splines, newdata = holdout_new)
tmp.rs <- conf_matrix_glmnet(glm_ridge_cv, newdata = holdout_new, rv = 'rv.gave')
# Data frame
model_compare <- cbind(
  glm_baseline_err
  , glm_nospline = c(tmp.ns$err, tmp.ns$prec, tmp.ns$sens, tmp.ns$F1)
  , glm_spline = c(tmp.s$err, tmp.s$prec, tmp.s$sens, tmp.ns$F1)
  , glm_ridge = c(tmp.rs$err, tmp.rs$prec, tmp.rs$sens, tmp.rs$F1)
)
remove(tmp.ns, tmp.s, tmp.rs)
print(model_compare)

But with a decision threshold of \(\theta =\) 0.5 the standard glm performs somewhat better, minimizing false negatives.

Consider the calibration plots.

smooth.method <- 'loess'
glm_preds <- data.frame(
  class = (holdoutdat[, 1] + 0) %>% unlist()
  , ridge.baseline = predict(glm_ridge_baseline_model, newdata = holdout_new, type = 'response')
  , nospline = predict(glm_standard, newdata = holdout_new, type = 'response')
  , spline = predict(glm_st_splines, newdata = holdout_new, type = 'response')
  , ridge = predict(glm_ridge_cv, newdata = holdout_new, type = 'response')
) %>% setNames(
  c('class', 'ridge.baseline', 'nospline', 'spline', 'ridge')
) %>% gather(
  'model', 'prediction', ridge.baseline:ridge
)
# Plotting
glm_preds %>%
  ggplot(aes(x = prediction, y = class, group = model, color = model)) +
  geom_point(color = 'black', alpha  = .1) +
  geom_smooth(method = smooth.method, alpha = .5) +
  geom_abline(slope = 1, intercept = 0) +
  labs(title = paste0('Predictions with OOS smoother (', smooth.method, ')'), color = 'model'
       , x = 'predicted probability'
       , y = 'observed probability')

Interestingly, out-of-box baseline ridge regression outperforms the ridge regression model with fewer explanatory variables. Between these four I’d take the spline glm due to its interpretability.

We can also look at the ROC curves.

rocdat <- cbind(model = 'ridge.baseline', roc_matrix_gen(glm_ridge_baseline_model, data = holdout_new)) %>%
  rbind(cbind(model = 'nospline', roc_matrix_gen(glm_standard, data = holdout_new))) %>%
  rbind(cbind(model = 'spline', roc_matrix_gen(glm_st_splines, data = holdout_new))) %>%
  rbind(cbind(model = 'ridge', roc_matrix_gen(glm_ridge_cv, data = holdout_new)))
# Plot results
rocdat %>%
  ggplot(aes(x = FPR, y = TPR, color = model)) +
  geom_line(size = 1) +
  geom_abline(slope = 1, intercept = 0, linetype = 'dashed', col = 'black') +
  scale_x_continuous(breaks = seq(0, 1, by = .1), expand = c(0, 0)) +
  scale_y_continuous(breaks = seq(0, 1, by = .1), expand = c(0, 0)) +
  coord_equal() +
  labs(title = 'ROC plot')

Computing the AUC:

data.frame(
    ridge.baseline = with(
        rocdat %>% filter(model == 'ridge.baseline')
      , sum(1/nrow(holdoutdat) * TPR)
    )
  , nospline = with(
        rocdat %>% filter(model == 'nospline')
      , sum(1/nrow(holdoutdat) * TPR)
    )
  , spline = with(
        rocdat %>% filter(model == 'spline')
      , sum(1/nrow(holdoutdat) * TPR)
    )
  , ridge = with(
        rocdat %>% filter(model == 'ridge')
      , sum(1/nrow(holdoutdat) * TPR)
    )
)

These are almost indistinguishable, but again the spline glm appears to be a reasonable choice.

Regression model

I found previously that linear regression actually works pretty well for predicting cumulative giving amounts, particularly when conditioning on donor status (thereby excluding all 0 entries).

\[ E \left(\text{log giving | donor, covariates} \right) = E\left(\text{log}\left(Y_i\right)\right) = X_i \boldsymbol{\beta} \]

Here, \(Y_i = \text{FY18Giving}_i + \text{FY17Giving}_i\) and the training data \(X_i\) includes the observations where \(Y_i > 0\).

Variable selection

I’ll again pre-screen variables with the Boruta algorithm, but this time the response variable is continuous and only donors will be included.

# Sample rows
prop = 1 # Proportion of data to sample; 1 for all donors
set.seed(7968177)
# Include only entities who gave
samp <- sample_n(
  modeling.data %>% filter(rv.gave)
  , size = nrow(modeling.data %>% filter(rv.gave)) * prop
  , replace = FALSE
) %>% select(
  -rv.gave, -ID_NUMBER, -HOUSEHOLD_ID, -INSTITUTIONAL_SUFFIX, -DEGREES_CONCAT
)
# Run Boruta algorithm, but only on entities that gave
rf.vars.lm <- Boruta(
    y = log10(samp$rv.amt)
    , x = samp %>% select(-rv.amt)
    , seed = 3371662
  )
rf.vars.lm %>% print()
Boruta performed 99 iterations in 36.06102 mins.
 83 attributes confirmed important: AF_PFY1, AF_PFY2, AF_PFY3, AF_PFY4, AF_PFY5 and 78
more;
 49 attributes confirmed unimportant: ACTIVITIES_CFY, ACTIVITIES_PFY1, ACTIVITIES_PFY2,
ACTIVITIES_PFY3, ACTIVITIES_PFY4 and 44 more;
 15 tentative attributes left: COMMITTEE_KSM_LDR, COMMITTEE_NU_DISTINCT, DAF_GIFTS_AMT,
EVENTS_PFY1, GIFT_CLUB_BEQUEST_YRS and 10 more;

Save the results.

save(rf.vars.lm, file = 'data/rf.vars.lm.Rdata')
(lmod_plot <- rf.vars.lm %>% Borutadata() %>% Borutaplotter())

Some unsurprising findings:

  • Again, past giving is the best predictor of future giving, particularly past totals and upgrades (velocity)
  • Generally speaking, more recent giving is more predictive than less recent giving
  • Prospect assignment and length of assignment is predictive of future giving
  • UOR and evaluation rating are predictive
  • Gift club membership is predictive
  • Event attendance is predictive

And some surprising ones:

  • Max cash giving is more predictive than new gifts and commitments. Perhaps there’s an unfulfilled pledge effect hidden away?
  • Giving 5 years ago is also pretty predictive - perhaps a paid off pledge effect?
  • Besides overall tenure, committee participation is not predictive
  • Donor Advised Fund giving amounts and stock gifts are not predictive
  • Contact information is not predictive
(recommended.vars.lm <- TentativeRoughFix(rf.vars.lm))
Boruta performed 99 iterations in 36.06102 mins.
Tentatives roughfixed over the last 99 iterations.
 92 attributes confirmed important: AF_PFY1, AF_PFY2, AF_PFY3, AF_PFY4, AF_PFY5 and 87
more;
 55 attributes confirmed unimportant: ACTIVITIES_CFY, ACTIVITIES_PFY1, ACTIVITIES_PFY2,
ACTIVITIES_PFY3, ACTIVITIES_PFY4 and 50 more;
# Check variable correlations
recommended_vars_lm <- recommended.vars.lm$finalDecision[
  which(recommended.vars.lm$finalDecision == 'Confirmed')] %>% names()
numeric_vars_lm <- modeling.data %>%
  filter(rv.gave) %>%
  select(recommended_vars_lm) %>%
  select_if(is.numeric)
numeric_vars_lm %>% plot_corrs(textsize = 2)

  • Probably only one of AF or CRU by year should be kept.
  • Probably only one of visitors and visits should be kept.

Cross-validation

The modeling data file is a slightly trimmed version of modeling.data.

# Data file with variables removed
lmdat <- modeling.data %>%
  filter(rv.gave) %>%
  select(rv.amt, recommended_vars_lm) %>%
  select(
    -GIVING_AF_TOTAL
    , -KSM_GOS
    , -contains('AF_PFY')
    , -VELOCITY3_LIN_CASH
    , -VELOCITY_BINS_NGC
    , -VELOCITY_BINS_CASH
    , -VELOCITY3_CASH
    , -VELOCITY3_NGC
    , -GIFTS_CASH
    , -VISITORS_5FY
    , -FIRST_KSM_YEAR
    , -GIVING_PLEDGE_TOTAL
    , -GIVING_MAX_CASH_FY
    , -GIFTS_MATCHES
    , -CRU_STATUS
    , -BIRTH_DT
    , -SPOUSE_SUFFIX
    , -PAST_KSM_GOS_FLAG
    , -GIVING_MAX_PLEDGE_MO
    , -UPGRADE3_NGC
  ) %>% mutate(
    # Create spouse flag
    SPOUSE_ALUM = ifelse(SPOUSE_FIRST_KSM_YEAR > 0, 'TRUE', 'FALSE') %>% factor()
    # Lump together little-used continents
    , HOUSEHOLD_CONTINENT = fct_lump(HOUSEHOLD_CONTINENT, prop = .0075)
    # Lump together little-used regions
    , HOUSEHOLD_REGION = fct_collapse(
        HOUSEHOLD_REGION
        , 'NB' = 'INTL'
    )
  ) %>% mutate_if(
    # Numeric variables over 1E4 get a log10 transformation
    function(x) {
      ifelse(is.numeric(x), max(x) >= 1E4, FALSE)
    }
    , log10plus1
  ) %>% select(
    -SPOUSE_FIRST_KSM_YEAR
  )
# Cross-validation settings
folds = 10
reps = 5
# Withhold 10% of data as test set
xv <- KFoldXVal(lmdat, k = 2, prop = .1, seed = 1626452)
holdoutdat <- lmdat[xv[[1]], ]
traindat <- lmdat[xv[[2]], ]
remove(xv)

Baseline linear regression

The model to beat will be a generic regression model with all variables previously identified as important.

# Store timings
timestamps <- list()
There were 18 warnings (use warnings() to see them)
# Store linear models
lm_baseline <- list()
# Seed for reproducibility
set.seed(2285286)
# Outer loop (repetitions)
for (rep in 1:reps) {
  # Status report 
  timestamp <- paste('+ Iteration', rep, 'beginning at:', Sys.time())
  print(timestamp)
  timestamps <- c(timestamps, timestamp)
  # Create cross-validation indices
  xv <- KFoldXVal(traindat, k = folds)
  # Inner loop (parallel cross-validation)
  models_out <- foreach(
    fold = 1:length(xv)
    , .combine = list
    , .multicombine = TRUE
    , .packages = c('dplyr', 'splines')
  ) %dopar% {
    # Fit temp model
      tmpmodel <- lm(
        rv.amt ~ .
        # Train while withholding some data
        , data = traindat[-xv[[fold]], ]
      )
      preds <- data.frame(
        prediction = predict(tmpmodel, newdata = traindat[xv[[fold]], ], type = 'response')
        , actual = traindat$rv.amt[xv[[fold]]]
      )
    # Return results
    return(
      list(
        rep = rep
        , fold = fold
        , model = tmpmodel
        , predictions = preds
      )
    )
  }
  # Write results to errors data frame
  lm_baseline <- c(lm_baseline, models_out)
  # Status report
  timestamp <- paste(' -Iteration', rep, 'ending at:   ', Sys.time())
  print(timestamp)
  timestamps <- c(timestamps, timestamp)
}
[1] "+ Iteration 1 beginning at: 2018-12-21 15:57:05"
[1] " -Iteration 1 ending at:    2018-12-21 15:57:06"
[1] "+ Iteration 2 beginning at: 2018-12-21 15:57:06"
[1] " -Iteration 2 ending at:    2018-12-21 15:57:08"
[1] "+ Iteration 3 beginning at: 2018-12-21 15:57:08"
[1] " -Iteration 3 ending at:    2018-12-21 15:57:09"
[1] "+ Iteration 4 beginning at: 2018-12-21 15:57:09"
[1] " -Iteration 4 ending at:    2018-12-21 15:57:10"
[1] "+ Iteration 5 beginning at: 2018-12-21 15:57:10"
[1] " -Iteration 5 ending at:    2018-12-21 15:57:11"
lm_models <- ListExtract(lm_baseline, 'model')
lm_preds <- ListExtract(lm_baseline, 'predictions')
n <- folds * reps
# r^2 plots
plot_r2(lm_models) +
  geom_text(y = seq(10, 150, length.out = n), label = 1:n, color = 'blue') 

The \(r^2\) results are good for this application (anything over .5 or so is reasonable).

plot_mses(lm_models, lm_preds)

This is a pretty good result, and the out-sample MSE is only slightly worse than the in-sample MSE.

plot_resids(lm_models, lm_preds)$insample

plot_resids(lm_models, lm_preds)$outsample

On average the model slightly overestimates on the low end and underestimates on the high end.

plot_qq(lm_models, lm_preds)$insample

plot_qq(lm_models, lm_preds)$outsample

The Q-Q plots support the earlier observation that there’s extra density in the tails.

Consider the model coefficients.

p.sig <- .05
plot_coefs(lm_models) +
  guides(color = FALSE) +
  scale_y_continuous(trans = 'neg_sqrt')

coef_pm_table(lm_models, p.sig)

The table indicates the number of models in which the coefficient was significantly positive or negative (or not signficantly different from 0) at the \(p =\) 0.05 level.

Linear regression with splines

Ridge regression

LASSO

Comparison

Conclusions

---
title: "05 KSM predictive model"
output:
  html_notebook:
    code_folding: hide
    toc: TRUE
    toc_float:
      collapsed: FALSE
---

# Goal

Build a basic campaign prioritization model using all relevant variables extracted from the database and identified in previous work.

# Setup

```{r setup, message = FALSE, warning = FALSE}
library(tidyverse)
library(reshape2)
library(gridExtra)
library(splines)
library(lubridate)
library(wranglR)
library(Boruta)
library(foreach)
library(doParallel)
library(glmnet)
library(glmnetUtils)

# Functions adapted from previous analysis steps
source('code/functions.R')

# Visualization functions adapted fron previous analysis steps
source('code/functions_viz.R')

# Set number of available CPU cores
registerDoParallel(detectCores() - 1)
```

# KSM model goals

The overarching goal is to predict giving over the final two years of the campaign. Ideally, I'd want to find expected future value, not just difference from expected value today. Consider the following:

$$ E \left( \text{giving, donor | covariates} \right) = E \left(\text{giving | donor, covariates} \right) P \left(\text{donor | covariates} \right) $$

Estimate the expected future value as the product of an expected value and a probability. This can also be thought of as separate capacity and affinity models, and should give more useful estimates than $E\left( \text{giving | covariates} \right)$, which is left-censored by \$0.

It'll be informative seeing what features are more or less important at each stage of the two-step procedure, though I expect overall accuracy to suffer somewhat. Down the road it would be interesting to compare this to other methods, like trees and boosting.

# KSM model variables

The target variable is the sum of new gifts and commitments from 9/1/16 to 8/31/18 (FY17-18), given the state of the database on 8/31/16 (FY16).

As a general principle, point-in-time data is derived from entered date ranges where possible. Where dates are missing, it will be based upon the date added or date modified audit trail for each field, as suitable. The following data types received this treatment:

  * All dollar amounts
  * All giving behavior counts and years
  * Student/alumni status
  * All prospect assignments and ratings
  * All contact information and indicators
  * Employment
  * Visits and outreach
  * Engagement counts

This is implemented by [this SQL code](https://github.com/phively/ksm-models/blob/master/pg-cultivation-score-fy18/code/ksm-point-in-time-data-pull.sql).

```{r}
# Parameters
train_fy <- 2016
filepath <- 'data/2018-11-30 point-in-time data.xlsx'
sheetname <- 'Select point_in_time_model'

# Import data
source('code/generate-pit-data.R')

# Run data generation function
modeling.data <- generate_pit_data(filepath, sheetname)

# Create response variables
modeling.data <- modeling.data %>% mutate(
  rv.amt = NGC_TARGET_FY2 + NGC_TARGET_FY1
  , rv.gave = rv.amt > 0
) %>% select(
  # Drop future data
  -NGC_TARGET_FY2
  , -NGC_TARGET_FY1
  , -CASH_TARGET_FY2
  , -CASH_TARGET_FY1
  , -PLEDGE_TARGET_FY2
  , -PLEDGE_TARGET_FY1
  , -AF_TARGET_FY2
  , -AF_TARGET_FY1
  , -CRU_TARGET_FY2
  , -CRU_TARGET_FY1
) %>% filter(
  # Drop entities whose RECORD_YR is after the training year
  RECORD_YR <= train_fy
)
```

# Probability model

Logistic regression has been the workhorse of fundraising models for years. Some special considerations for this application:

  * Minimizing predictive error, e.g. finding the model $\text{argmin}_m \sum_i \left[ y_i - \widehat{m}_x(x_i) \right]^2$, on in-sample data is the *wrong* metric!
  * Focus on identifying as many current prospects as possible (minimizing type II error); type I is acceptable as these become new prospects.
  * Avoid overfitting the training data. Techniques like [cross-validation](https://en.wikipedia.org/wiki/Cross-validation_(statistics)) are highly recommended.
  * Avoid [endogenous](https://en.wikipedia.org/wiki/Endogeneity_(econometrics)) variables; in this context, that means those that are causally associated with the outcome being measured, e.g. don't use `Lifetime.Giving` as a predictor if the response variable is `Largest.Gift`.

I have [previously found](https://github.com/phively/ksm-models/tree/master/af-10k-fy17) that penalized logistic regression, such as implemented in R by the glmnet package, works better than standard logistic regression, so that's the technique that I'll use here.

Here, the response variable is:

$$ Y_i = I \left( \text{FY18Giving}_i + \text{FY17Giving}_i > 0  \right) $$

## Variable selection

I like computing random forest variable importance, e.g. [Sauve & Tuleau-Malot (2014)](https://hal-unice.archives-ouvertes.fr/hal-00551375/document), to pre-screen variables. Define variable importance in a random forest as the change in MSE when permuting a given observation vector. One nice feature is that highly correlated variables should be similarly important.


```{r, cache = TRUE}
# Sample rows
prop = 1/5 # Proportion of data to sample
set.seed(287092)
samp <- sample_n(modeling.data, size = nrow(modeling.data) * prop)

# Run Boruta algorithm
rf.vars <- Boruta(
    y = as.numeric(samp$rv.gave)
    , x = samp %>% select(-rv.amt, -rv.gave)
    , seed = 5993207
  )
```
```{r}
rf.vars %>% print()
```


Save the results.

```{r}
save(rf.vars, file = 'data/rf.vars.Rdata')
```


Plot the results.

```{r, fig.width = 8, fig.height = 20}
(pmod_plot <- rf.vars %>% Borutadata() %>% Borutaplotter())
```

Basically, the algorithm creates dummy "shadow" variables, which are permuted versions of the explanatory variables appearing above, and random forests are fit on both the real and dummy variables. Intuitively, if replacing a variable with a randomly permuted version of itself does not reduce the random forest classifier's accuracy, then the variable should not be included in a final model and can be discarded.

Recall that the response variable is making a new gift or commitment at any level within the next two years. From past experience, I know that most donations are outright gifts, under $1,000, and to an annual giving allocation. So the following is not too surprising:

  * Past giving is the best predictor of future giving
  * More recent giving behavior is more predictive than less recent giving behavior
  * Other engagement indicators (e.g. events, committees) are predictive in aggregate
  * Cash is more predictive than new gifts & commitments
  * Having active home contact information is predictive

I found these more surprising:

  * Having business contact information is not predictive
  * Prospect indicators (is a prospect, number of visits, rating, etc.) are only weakly predictive
  * ID numbers are predictive, but other personal identifiers like name are not -- presumably because of the ID number/age correlation?
  * KSM-specific engagement is more predictive than NU engagement

```{r}
(recommended.vars <- TentativeRoughFix(rf.vars))
```

```{r, fig.width = 16, fig.height = 16}
# Check variable correlations
recommended_vars <- recommended.vars$finalDecision[
  which(recommended.vars$finalDecision == 'Confirmed')] %>% names()
numeric_vars <- modeling.data %>%
  select(recommended_vars) %>%
  select(-ID_NUMBER, -HOUSEHOLD_ID) %>%
  select_if(is.numeric)
numeric_vars %>% plot_corrs(textsize = 2)
```

This is the correlation matrix for all `r numeric_vars %>% ncol() %>% I()` numeric variables confirmed important by the algorithm.

  * AF, cash, and CRU are not as highly correlated as I would've expected. However, AF and CRU are moderately highly correlated, AF's definition has changed over time, so consider using CRU and cash only.
  * Count of gifts and payments, count of cash gifts, count of FYs supported, and count of allocations supported are all highly correlated. Consider dropping some of them.

## Cross-validation

Begin by creating the modeling data file.

```{r}
# Data file with variables removed
mdat <- modeling.data %>% select(rv.gave, recommended_vars) %>%
  select(
    -VELOCITY3_NGC, -VELOCITY_BINS_NGC, -VELOCITY_BINS_CASH, -VELOCITY3_LIN_NGC
    , -GIVING_MAX_PLEDGE_YR, -GIVING_MAX_PLEDGE_FY, -CRU_STATUS
    , -NGC_PFY1, -NGC_PFY2, -NGC_PFY3, -NGC_PFY4, -NGC_PFY5
    , -AF_PFY1, -AF_PFY2, -AF_PFY3, -AF_PFY4, -AF_PFY5
    , -GIVING_MAX_CASH_FY, -GIVING_NGC_TOTAL, -UPGRADE3_NGC, -LOYAL_5_PCT_ANY
    , -DEGREES_CONCAT, -BIRTH_DT, -FIRST_KSM_YEAR
    , -ID_NUMBER, -INSTITUTIONAL_SUFFIX # Keep HHID but don't use in modeling
    , -KSM_GOS, -HOUSEHOLD_COUNTRY
    , -KSM_EVENTS_ATTENDED, -EVENTS_ATTENDED
  ) %>% mutate(
    # Create spouse flag
    SPOUSE_ALUM = ifelse(SPOUSE_FIRST_KSM_YEAR > 0, 'TRUE', 'FALSE') %>% factor()
  ) %>% mutate_if(
    # Numeric variables over 1E4 get a log10 transformation
    function(x) {
      ifelse(is.numeric(x), max(x) >= 1E4, FALSE)
    }
    , log10plus1
  )

# Cross-validation settings
folds = 10
reps = 5

# Withhold 10% of data as test set
xv <- KFoldXVal(mdat, k = 2, prop = .1, seed = 4960582)
holdoutdat <- mdat[xv[[1]], ]
traindat <- mdat[xv[[2]], ]
remove(xv)
```

### Recommendations

  * `r folds %>% I()`-fold cross-validation repeated `r reps %>% I()` times
  * Estimate prediction error with out-of-sample classification error
  * $\theta_{1}$ threshold (donors) set to the empirical probability in the cross-validation set
  * Try to preserve continuous variables; reasonable monotonic transformations are fine, but avoid discretization

### Baseline penalized logistic regression

I'll use a penalized ridge regression model as implemented by glmnet. Advantages of shrinkage techniques include automatically controlling for overfitting and collinearity.

```{r, cache = TRUE}
# Store timings
glm_ridge_baseline_timestamps <- list()
# Store model errors
glm_nospline <- list()
# Seed for reproducibility
set.seed(2934223)

# Outer loop (repetitions)
for (rep in 1:reps) {
  # Status report 
  timestamp <- paste('+ Iteration', rep, 'beginning at:', Sys.time())
  print(timestamp)
  glm_ridge_baseline_timestamps <- c(glm_ridge_baseline_timestamps, timestamp)
  # Create cross-validation indices
  xv <- KFoldXVal(traindat, k = folds)
  # Inner loop (parallel cross-validation)
  errs_out <- foreach(
    fold = 1:length(xv)
    , .combine = c
    , .packages = c('glmnet', 'glmnetUtils', 'dplyr', 'splines')
  ) %dopar% {
    # Fit temp model, where alpha = 0 is the ridge regression penalty
      tmpmodel <- cv.glmnet(
        rv.gave ~ .
        # Train while withholding some data
        , data = traindat[-xv[[fold]], ] %>% select(-HOUSEHOLD_ID)
        , family = 'binomial'
        , alpha = 0
        , lambda = 2^(-8:5)
      )
    # Prediction threshold
    theta1 <- sum(traindat$rv.gave[-xv[[fold]]] == 1) / nrow(traindat[-xv[[fold]], ])
    # Confusion matrix based on the withheld data
    tmpconfus <- conf_matrix_glmnet(tmpmodel, newdata = traindat[xv[[fold]], ], rv = 'rv.gave', threshold = theta1)
    # Return results
    return(
      list(
        conf_matrix = tmpconfus$conf_matrix
        , conf_matrix_pct = tmpconfus$conf_matrix_pct
        , errors = data.frame(
          reps = rep
          , folds = fold
          , error = tmpconfus$error
          , precision = tmpconfus$precision
          , sensitivity = tmpconfus$sensitivity
          , F1_score = tmpconfus$F1_score
        )
      )
    )
  }
  # Write results to errors data frame
  glm_nospline <- c(glm_nospline, errs_out)
  # Status report
  timestamp <- paste(' -Iteration', rep, 'ending at:   ', Sys.time())
  print(timestamp)
  glm_ridge_baseline_timestamps <- c(glm_ridge_baseline_timestamps, timestamp)
}
```
```{r}
glm_ridge_baseline_timestamps %>% unlist() %>% print()
```

```{r}
# Function to reshape list data
combine_xval <- function(xval_results = list()) {
  # Function to reformat list output into groups
  delister <- function(full_list, first_idx = 1, seq) {
    output <- list()
    idx <- seq(first_idx, length(full_list), by = seq)
    for (i in 1:length(idx)) {
      output <- c(output, full_list[idx[i]])
    }
    return(output)
  }
  # Separate the output into groups of 3
  conf_matrix = delister(xval_results, 1, 3)
  conf_matrix_pct = delister(xval_results, 2, 3)
  errors = delister(xval_results, 3, 3)
  # Turn errors into a data frame
  errors <- foreach(i = 1:length(errors), .combine = rbind) %do% {
    return(errors[[i]])
  } %>% data.frame()
  # Return organized list
  return(
    list(
      conf_matrix = conf_matrix
      , conf_matrix_pct = conf_matrix_pct
      , errors = errors
    )
  )
}
```

```{r}
# Save results
glm_ridge_baseline_results <- combine_xval(glm_nospline)
glm_ridge_baseline_model <- cv.glmnet(
        rv.gave ~ .
        , data = traindat %>% select(-HOUSEHOLD_ID)
        , family = 'binomial'
        , alpha = 0
      )
save(
  glm_nospline
  , glm_ridge_baseline_model
  , glm_ridge_baseline_results
  , glm_ridge_baseline_timestamps
  , file = 'data/glm_ridge_baseline.Rdata'
)
```

```{r}
grid.arrange(
    histogrammer(glm_ridge_baseline_results$errors, 'error', h = .0005, fill = 'pink')
  , histogrammer(glm_ridge_baseline_results$errors, 'precision', h = .005, fill = 'cyan')
  , histogrammer(glm_ridge_baseline_results$errors, 'sensitivity', h = .005, fill = 'green')
)
```

Let TP, TN, FP, FN refer to true positives, true negatives, false positives, and false negatives respectively.

$$ \text{error} = \frac{FP + FN}{n}$$
$$ \text{precision} = \frac{TP}{TP + FP}$$
$$ \text{sensitivity} = \frac{TP}{TP + FN}$$

Compared to the AF $10K model, this has higher error due to the decreased sensitivity, but much higher precision.

The metrics to beat so far:

```{r}
(
glm_baseline_err <- data.frame(
  glm_ridge_baseline = glm_ridge_baseline_results$errors %>%
    select(-reps, -folds) %>%
    colMeans()
)
)
```

### Standard logistic regression

Consider a standard logistic regression model to get a better sense of the explanatory variables.

```{r}
glm_standard <- glm(
  rv.gave ~ .
  , data = traindat %>% select(-HOUSEHOLD_ID) %>%
    select(-RECORD_STATUS_CODE) # Results in separation if included
  , family = 'binomial'
)
```
```{r}
summary(glm_standard)
```
```{r, fig.width = 20, fig.height = 20}
summary(glm_standard, corr = TRUE)$correlation %>%
  data.frame() %>%
  plot_corrs()
```

Pretty eyewatering. Look at the term plots.

```{r}
termplot(glm_standard)
```

Definitely keep:

  * Program group looks very interesting
  * Pref addr type code could be interesting
  * CRU giving segment looks very interesting too
  * Spouse alum or spouse KSM year, not both
  
Definitely drop:

  * Has Home Email
  * Gifts credit card
  * Gift clubs fields
  * KSM GOs flag
  * Evaluation and UOR
  * KSM prospect flag
  * KSM Events Reunions
  * Giving max pledge mo

Needs transformation:

  * Giving first year
  * Months assigned
  * Events prev 3 FY
  * Events CFY
  * Athletics ticket last
  * Record yr
  * Max cash year

Duplicative:

  * Giving first year pledge amt
  * Giving max cash amt
  * Giving AF total
  * Gifts outrights payments
  * CRU PFY1 through 5
  * Committees CFY and PFY 1-3
  * Events yrs and KSM events yrs
  * Velocity3 cash
  * Spouse first KSM year

```{r}
glm_standard <- glm_standard %>% update(
  data = traindat %>% select(
    -HOUSEHOLD_ID
    , -RECORD_STATUS_CODE
    # Drop
    , -HAS_HOME_EMAIL
    , -GIFTS_CREDIT_CARD
    , -contains('GIFT_CLUB')
    , -KSM_GOS_FLAG
    , -EVALUATION_LOWER_BOUND
    , -UOR_LOWER_BOUND
    , -KSM_PROSPECT
    , -KSM_EVENTS_REUNIONS
    , -GIVING_MAX_PLEDGE_MO
    # Duplicative
    , -GIVING_FIRST_YEAR_PLEDGE_AMT
    , -GIVING_MAX_CASH_AMT
    , -GIVING_AF_TOTAL
    , -GIFTS_OUTRIGHTS_PAYMENTS
    , -contains('CRU_PFY')
    , -contains('COMMITTEES_')
    , -contains('EVENTS_YRS')
    , -VELOCITY3_CASH
    , -SPOUSE_FIRST_KSM_YEAR
  )
)
```
```{r}
summary(glm_standard)
```

The AIC is higher, but comparable. 

### Logistic regression with splines

```{r}
dfs <- 4
```

Now introduce splines on the numeric variables, arbitrarily setting df = `r dfs %>% I()`.

```{r}
glm_st_splines <- glm(
  rv.gave ~
    PROGRAM_GROUP +
    PREF_ADDR_TYPE_CODE +
    HOUSEHOLD_CONTINENT +
    BUS_IS_EMPLOYED +
    HAS_HOME_ADDR +
    HAS_HOME_PHONE +
    ns(YEARS_SINCE_FIRST_GIFT, df = dfs) +
    ns(GIVING_FIRST_YEAR_CASH_AMT, df = dfs) +
    ns(GIVING_MAX_PLEDGE_AMT, df = dfs) +
    ns(GIVING_CASH_TOTAL, df = dfs) +
    ns(GIVING_PLEDGE_TOTAL, df = dfs) +
    ns(GIVING_CRU_TOTAL, df = dfs) +
    ns(GIFTS_ALLOCS_SUPPORTED, df = dfs) +
    ns(GIFTS_FYS_SUPPORTED, df = dfs) +
    ns(GIFTS_CASH, df = dfs) +
    ns(GIFTS_PLEDGES, df = dfs) +
    ns(CASH_PFY1, df = dfs) +
    ns(CASH_PFY2, df = dfs) +
    ns(CASH_PFY3, df = dfs) +
    ns(CASH_PFY4, df = dfs) +
    ns(CASH_PFY5, df = dfs) +
    CRU_GIVING_SEGMENT +
    ns(EVALUATION_LOWER_BOUND, df = dfs) +
    ns(UOR_LOWER_BOUND, df = dfs) +
    ns(MONTHS_ASSIGNED, df = dfs) +
    ns(COMMITTEE_NU_DISTINCT, df = dfs) +
    ns(COMMITTEE_NU_YEARS, df = dfs) +
    ns(COMMITTEE_KSM_DISTINCT, df = dfs) +
    ns(EVENTS_PREV_3_FY, df = dfs) +
    ns(EVENTS_CFY, df = dfs) +
    ns(EVENTS_PFY1, df = dfs) +
    ns(ATHLETICS_TICKET_YEARS, df = dfs) +
    ns(YEARS_SINCE_ATHLETICS_TICKETS, df = dfs) +
    ns(RECORD_YR, df = dfs) +
    ns(YEARS_SINCE_MAX_CASH_YR, df = dfs) +
    GIVING_MAX_CASH_MO +
    KSM_PROSPECT +
    ns(VISITORS_5FY, df = dfs) +
    LOYAL_5_PCT_CASH +
    UPGRADE3_CASH +
    VELOCITY3_LIN_CASH +
    SPOUSE_ALUM
  , data = traindat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_ATHLETICS_TICKETS = 2016 - ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
  , family = 'binomial'
)
```
```{r}
summary(glm_st_splines)
```

```{r}
termplot(glm_st_splines)
```

Some more thoughts.

  * Don't put splines on the already-transformed giving variables
  * Consider the standard square root variance stabilizing transformation for counts
  * Try using "years since last (behavior) year"

```{r}
glm_st_splines <- glm(
  rv.gave ~
    PROGRAM_GROUP +
    PREF_ADDR_TYPE_CODE +
    HOUSEHOLD_CONTINENT +
    BUS_IS_EMPLOYED +
    HAS_HOME_ADDR +
    HAS_HOME_PHONE +
    # ns(YEARS_SINCE_FIRST_GIFT, 2) +
    # GIVING_FIRST_YEAR_CASH_AMT +
    # GIVING_MAX_PLEDGE_AMT +
    GIVING_CASH_TOTAL +
    # GIVING_PLEDGE_TOTAL +
    # GIVING_CRU_TOTAL +
    # sqrt(GIFTS_ALLOCS_SUPPORTED) +
    sqrt(GIFTS_FYS_SUPPORTED) +
    # sqrt(GIFTS_CASH) +
    sqrt(GIFTS_PLEDGES) +
    CASH_PFY1 +
    CASH_PFY2 +
    CASH_PFY3 +
    CASH_PFY4 +
    CASH_PFY5 +
    CRU_GIVING_SEGMENT +
    # EVALUATION_LOWER_BOUND +
    # UOR_LOWER_BOUND +
    # sqrt(MONTHS_ASSIGNED) +
    # sqrt(COMMITTEE_NU_DISTINCT) +
    # sqrt(COMMITTEE_NU_YEARS) +
    # sqrt(COMMITTEE_KSM_DISTINCT) +
    # sqrt(EVENTS_PREV_3_FY) +
    sqrt(EVENTS_CFY) +
    # sqrt(EVENTS_PFY1) +
    # sqrt(ATHLETICS_TICKET_YEARS) +
    # YEARS_SINCE_ATHLETICS_TICKETS +
    ns(RECORD_YR, df = 5) +
    YEARS_SINCE_MAX_CASH_YR +
    GIVING_MAX_CASH_MO +
    # KSM_PROSPECT +
    # sqrt(VISITORS_5FY) +
    LOYAL_5_PCT_CASH +
    # UPGRADE3_CASH +
    # VELOCITY3_LIN_CASH +
    SPOUSE_ALUM
  , data = traindat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
  , family = 'binomial'
)
```
```{r}
summary(glm_st_splines)
```

Again, similar AIC.

### Penalized logistic regression, dropped variables

Fit a logistic regression model with the ridge penalizer using the same subset of variables chosen in the previous step.

```{r}
glm_ridge_cv <- cv.glmnet(
  rv.gave ~
    PROGRAM_GROUP +
    PREF_ADDR_TYPE_CODE +
    HOUSEHOLD_CONTINENT +
    BUS_IS_EMPLOYED +
    HAS_HOME_ADDR +
    HAS_HOME_PHONE +
    # ns(YEARS_SINCE_FIRST_GIFT, 2) +
    # GIVING_FIRST_YEAR_CASH_AMT +
    # GIVING_MAX_PLEDGE_AMT +
    GIVING_CASH_TOTAL +
    # GIVING_PLEDGE_TOTAL +
    # GIVING_CRU_TOTAL +
    # sqrt(GIFTS_ALLOCS_SUPPORTED) +
    sqrt(GIFTS_FYS_SUPPORTED) +
    # sqrt(GIFTS_CASH) +
    sqrt(GIFTS_PLEDGES) +
    CASH_PFY1 +
    CASH_PFY2 +
    CASH_PFY3 +
    CASH_PFY4 +
    CASH_PFY5 +
    CRU_GIVING_SEGMENT +
    # EVALUATION_LOWER_BOUND +
    # UOR_LOWER_BOUND +
    # sqrt(MONTHS_ASSIGNED) +
    # sqrt(COMMITTEE_NU_DISTINCT) +
    # sqrt(COMMITTEE_NU_YEARS) +
    # sqrt(COMMITTEE_KSM_DISTINCT) +
    # sqrt(EVENTS_PREV_3_FY) +
    sqrt(EVENTS_CFY) +
    # sqrt(EVENTS_PFY1) +
    # sqrt(ATHLETICS_TICKET_YEARS) +
    # YEARS_SINCE_ATHLETICS_TICKETS +
    ns(RECORD_YR, df = 5) +
    YEARS_SINCE_MAX_CASH_YR +
    GIVING_MAX_CASH_MO +
    # KSM_PROSPECT +
    # sqrt(VISITORS_5FY) +
    LOYAL_5_PCT_CASH +
    # UPGRADE3_CASH +
    # VELOCITY3_LIN_CASH +
    SPOUSE_ALUM
  , data = traindat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_ATHLETICS_TICKETS = 2016 - ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
  , family = 'binomial'
  , alpha = 0 # Ridge penalty
)
```

Compare coefficients between the penalized and unpenalized models.

```{r, warning = FALSE, fig.width = 12, fig.height = 6}
full_join(
    data.frame(var = coef(glm_st_splines) %>% names(), unpenalized = coef(glm_st_splines))
  , data.frame(var = coef(glm_ridge_cv)[, 1] %>% names(), shrinkage = coef(glm_ridge_cv)[, 1])
  , by = c('var', 'var')
) %>% gather(model, 'coefficient', 2:3) %>%
  na.omit() %>%
  arrange(abs(coefficient) %>% desc()) %>%
  ggplot(aes(x = var %>% reorder(-abs(coefficient)), y = coefficient, color = model)) +
  geom_hline(yintercept = 0, color = 'darkgray') +
  geom_point(alpha = .5) +
  scale_y_continuous(trans = 'neg_sqrt', breaks = c(-50, -40, -30, seq(-20, 20, by = 5), -2, -.5, .5, 2)) +
  theme(axis.text.x = element_text(angle = 90, hjust = 1, vjust = .3)
            , panel.grid.minor = element_line(linetype = 'dotted')) +
  labs(x = 'var')
```

The ridge penalty leads to fairly aggressive coefficient shrinkage.

### Comparison

```{r}
# Holdout data with new variables
holdout_new <- holdoutdat %>% mutate(
    YEARS_SINCE_FIRST_GIFT = 2016 - ifelse(GIVING_FIRST_YEAR > 0, GIVING_FIRST_YEAR, 2017)
    , YEARS_SINCE_ATHLETICS_TICKETS = 2016 - ifelse(ATHLETICS_TICKET_LAST > 0, ATHLETICS_TICKET_LAST, 2017)
    , YEARS_SINCE_MAX_CASH_YR = 2016 - ifelse(GIVING_MAX_CASH_YR > 0, GIVING_MAX_CASH_YR, 2017)
  )
# Threshold
theta1 <- sum(traindat$rv.gave) / nrow(traindat)
# Calculations
tmp.ns <- conf_matrix(glm_standard, newdata = holdoutdat, threshold = theta1)
tmp.s <- conf_matrix(glm_st_splines, newdata = holdout_new, threshold = theta1)
tmp.rs <- conf_matrix_glmnet(glm_ridge_cv, newdata = holdout_new, rv = 'rv.gave', threshold = theta1)
# Data frame
model_compare <- cbind(
  glm_baseline_err
  , glm_nospline = c(tmp.ns$err, tmp.ns$prec, tmp.ns$sens, tmp.ns$F1)
  , glm_spline = c(tmp.s$err, tmp.s$prec, tmp.s$sens, tmp.ns$F1)
  , glm_ridge = c(tmp.rs$err, tmp.rs$prec, tmp.rs$sens, tmp.rs$F1)
)
remove(tmp.ns, tmp.s, tmp.rs)
```
```{r}
print(model_compare)
```

With threshold $\theta =$ `r theta1 %>% round(3) %>% I()` the glm_ridge model is the winner.

```{r}
# Calculations
tmp.ns <- conf_matrix(glm_standard, newdata = holdoutdat)
tmp.s <- conf_matrix(glm_st_splines, newdata = holdout_new)
tmp.rs <- conf_matrix_glmnet(glm_ridge_cv, newdata = holdout_new, rv = 'rv.gave')
# Data frame
model_compare <- cbind(
  glm_baseline_err
  , glm_nospline = c(tmp.ns$err, tmp.ns$prec, tmp.ns$sens, tmp.ns$F1)
  , glm_spline = c(tmp.s$err, tmp.s$prec, tmp.s$sens, tmp.ns$F1)
  , glm_ridge = c(tmp.rs$err, tmp.rs$prec, tmp.rs$sens, tmp.rs$F1)
)
remove(tmp.ns, tmp.s, tmp.rs)
```
```{r}
print(model_compare)
```

But with a decision threshold of $\theta =$ 0.5 the standard glm performs somewhat better, minimizing false negatives.

Consider the calibration plots.

```{r, fig.width = 10, fig.height = 6}
smooth.method <- 'loess'
glm_preds <- data.frame(
  class = (holdoutdat[, 1] + 0) %>% unlist()
  , ridge.baseline = predict(glm_ridge_baseline_model, newdata = holdout_new, type = 'response')
  , nospline = predict(glm_standard, newdata = holdout_new, type = 'response')
  , spline = predict(glm_st_splines, newdata = holdout_new, type = 'response')
  , ridge = predict(glm_ridge_cv, newdata = holdout_new, type = 'response')
) %>% setNames(
  c('class', 'ridge.baseline', 'nospline', 'spline', 'ridge')
) %>% gather(
  'model', 'prediction', ridge.baseline:ridge
)
# Plotting
glm_preds %>%
  ggplot(aes(x = prediction, y = class, group = model, color = model)) +
  geom_point(color = 'black', alpha  = .1) +
  geom_smooth(method = smooth.method, alpha = .5) +
  geom_abline(slope = 1, intercept = 0) +
  labs(title = paste0('Predictions with OOS smoother (', smooth.method, ')'), color = 'model'
       , x = 'predicted probability'
       , y = 'observed probability')
```

Interestingly, out-of-box baseline ridge regression outperforms the ridge regression model with fewer explanatory variables. Between these four I'd take the spline glm due to its interpretability.

We can also look at the ROC curves.

```{r, fig.width = 8, fig.height = 8}
rocdat <- cbind(model = 'ridge.baseline', roc_matrix_gen(glm_ridge_baseline_model, data = holdout_new)) %>%
  rbind(cbind(model = 'nospline', roc_matrix_gen(glm_standard, data = holdout_new))) %>%
  rbind(cbind(model = 'spline', roc_matrix_gen(glm_st_splines, data = holdout_new))) %>%
  rbind(cbind(model = 'ridge', roc_matrix_gen(glm_ridge_cv, data = holdout_new)))
# Plot results
rocdat %>%
  ggplot(aes(x = FPR, y = TPR, color = model)) +
  geom_line(size = 1) +
  geom_abline(slope = 1, intercept = 0, linetype = 'dashed', col = 'black') +
  scale_x_continuous(breaks = seq(0, 1, by = .1), expand = c(0, 0)) +
  scale_y_continuous(breaks = seq(0, 1, by = .1), expand = c(0, 0)) +
  coord_equal() +
  labs(title = 'ROC plot')
```

Computing the AUC:

```{r}
data.frame(
    ridge.baseline = with(
        rocdat %>% filter(model == 'ridge.baseline')
      , sum(1/nrow(holdoutdat) * TPR)
    )
  , nospline = with(
        rocdat %>% filter(model == 'nospline')
      , sum(1/nrow(holdoutdat) * TPR)
    )
  , spline = with(
        rocdat %>% filter(model == 'spline')
      , sum(1/nrow(holdoutdat) * TPR)
    )
  , ridge = with(
        rocdat %>% filter(model == 'ridge')
      , sum(1/nrow(holdoutdat) * TPR)
    )
)
```

These are almost indistinguishable, but again the spline glm appears to be a reasonable choice.

# Regression model

I [found previously](https://cdn.rawgit.com/phively/ksm-models/c58e8065/pg-cultivation-score-fy18/02%20Cultivation%20score%20weights.nb.html) that linear regression actually works pretty well for predicting cumulative giving amounts, particularly when conditioning on donor status (thereby excluding all 0 entries).

$$ E \left(\text{log giving | donor, covariates} \right) = E\left(\text{log}\left(Y_i\right)\right) = X_i \boldsymbol{\beta} $$

Here, $Y_i = \text{FY18Giving}_i + \text{FY17Giving}_i$ and the training data $X_i$ includes the observations where $Y_i > 0$.

## Variable selection

I'll again pre-screen variables with the Boruta algorithm, but this time the response variable is continuous and only donors will be included.

```{r, cache = TRUE}
# Sample rows
prop = 1 # Proportion of data to sample; 1 for all donors
set.seed(7968177)
# Include only entities who gave
samp <- sample_n(
  modeling.data %>% filter(rv.gave)
  , size = nrow(modeling.data %>% filter(rv.gave)) * prop
  , replace = FALSE
) %>% select(
  -rv.gave, -ID_NUMBER, -HOUSEHOLD_ID, -INSTITUTIONAL_SUFFIX, -DEGREES_CONCAT
)

# Run Boruta algorithm, but only on entities that gave
rf.vars.lm <- Boruta(
    y = log10(samp$rv.amt)
    , x = samp %>% select(-rv.amt)
    , seed = 3371662
  )
```
```{r}
rf.vars.lm %>% print()
```

Save the results.

```{r}
save(rf.vars.lm, file = 'data/rf.vars.lm.Rdata')
```

```{r, fig.width = 8, fig.height = 20}
(lmod_plot <- rf.vars.lm %>% Borutadata() %>% Borutaplotter())
```

Some unsurprising findings:

  * Again, past giving is the best predictor of future giving, particularly past totals and upgrades (velocity)
  * Generally speaking, more recent giving is more predictive than less recent giving
  * Prospect assignment and length of assignment is predictive of future giving
  * UOR and evaluation rating are predictive
  * Gift club membership is predictive
  * Event attendance is predictive
  
And some surprising ones:

  * Max cash giving is more predictive than new gifts and commitments. Perhaps there's an unfulfilled pledge effect hidden away?
  * Giving 5 years ago is also pretty predictive - perhaps a paid off pledge effect?
  * Besides overall tenure, committee participation is not predictive
  * Donor Advised Fund giving amounts and stock gifts are not predictive
  * Contact information is not predictive

```{r}
(recommended.vars.lm <- TentativeRoughFix(rf.vars.lm))
```

```{r, fig.width = 16, fig.height = 16}
# Check variable correlations
recommended_vars_lm <- recommended.vars.lm$finalDecision[
  which(recommended.vars.lm$finalDecision == 'Confirmed')] %>% names()
numeric_vars_lm <- modeling.data %>%
  filter(rv.gave) %>%
  select(recommended_vars_lm) %>%
  select_if(is.numeric)
numeric_vars_lm %>% plot_corrs(textsize = 2)
```

  * Probably only one of AF or CRU by year should be kept.
  * Probably only one of visitors and visits should be kept.

## Cross-validation

The modeling data file is a slightly trimmed version of modeling.data.

```{r}
# Data file with variables removed
lmdat <- modeling.data %>%
  filter(rv.gave) %>%
  select(rv.amt, recommended_vars_lm) %>%
  select(
    -GIVING_AF_TOTAL
    , -KSM_GOS
    , -contains('AF_PFY')
    , -VELOCITY3_LIN_CASH
    , -VELOCITY_BINS_NGC
    , -VELOCITY_BINS_CASH
    , -VELOCITY3_CASH
    , -VELOCITY3_NGC
    , -GIFTS_CASH
    , -VISITORS_5FY
    , -FIRST_KSM_YEAR
    , -GIVING_PLEDGE_TOTAL
    , -GIVING_MAX_CASH_FY
    , -GIFTS_MATCHES
    , -CRU_STATUS
    , -BIRTH_DT
    , -SPOUSE_SUFFIX
    , -PAST_KSM_GOS_FLAG
    , -GIVING_MAX_PLEDGE_MO
    , -UPGRADE3_NGC
  ) %>% mutate(
    # Create spouse flag
    SPOUSE_ALUM = ifelse(SPOUSE_FIRST_KSM_YEAR > 0, 'TRUE', 'FALSE') %>% factor()
    # Lump together little-used continents
    , HOUSEHOLD_CONTINENT = fct_lump(HOUSEHOLD_CONTINENT, prop = .0075)
    # Lump together little-used regions
    , HOUSEHOLD_REGION = fct_collapse(
        HOUSEHOLD_REGION
        , 'NB' = 'INTL'
    )
  ) %>% mutate_if(
    # Numeric variables over 1E4 get a log10 transformation
    function(x) {
      ifelse(is.numeric(x), max(x) >= 1E4, FALSE)
    }
    , log10plus1
  ) %>% select(
    -SPOUSE_FIRST_KSM_YEAR
  )

# Cross-validation settings
folds = 10
reps = 5

# Withhold 10% of data as test set
xv <- KFoldXVal(lmdat, k = 2, prop = .1, seed = 1626452)
holdoutdat <- lmdat[xv[[1]], ]
traindat <- lmdat[xv[[2]], ]
remove(xv)
```

### Baseline linear regression

The model to beat will be a generic regression model with all variables previously identified as important.

```{r}
# Store timings
timestamps <- list()
# Store linear models
lm_baseline <- list()
# Seed for reproducibility
set.seed(2285286)

# Outer loop (repetitions)
for (rep in 1:reps) {
  # Status report 
  timestamp <- paste('+ Iteration', rep, 'beginning at:', Sys.time())
  print(timestamp)
  timestamps <- c(timestamps, timestamp)
  # Create cross-validation indices
  xv <- KFoldXVal(traindat, k = folds)
  # Inner loop (parallel cross-validation)
  models_out <- foreach(
    fold = 1:length(xv)
    , .combine = list
    , .multicombine = TRUE
    , .packages = c('dplyr', 'splines')
  ) %dopar% {
    # Fit temp model
      tmpmodel <- lm(
        rv.amt ~ .
        # Train while withholding some data
        , data = traindat[-xv[[fold]], ]
      )
      preds <- data.frame(
        prediction = predict(tmpmodel, newdata = traindat[xv[[fold]], ], type = 'response')
        , actual = traindat$rv.amt[xv[[fold]]]
      )
    # Return results
    return(
      list(
        rep = rep
        , fold = fold
        , model = tmpmodel
        , predictions = preds
      )
    )
  }
  # Write results to errors data frame
  lm_baseline <- c(lm_baseline, models_out)
  # Status report
  timestamp <- paste(' -Iteration', rep, 'ending at:   ', Sys.time())
  print(timestamp)
  timestamps <- c(timestamps, timestamp)
}
```

```{r, warning = FALSE, error = FALSE}
lm_models <- ListExtract(lm_baseline, 'model')
lm_preds <- ListExtract(lm_baseline, 'predictions')
n <- folds * reps
```
```{r, warning = FALSE, error = FALSE}
# r^2 plots
plot_r2(lm_models) +
  geom_text(y = seq(10, 150, length.out = n), label = 1:n, color = 'blue') 
```

The $r^2$ results are good for this application (anything over .5 or so is reasonable).

```{r, warning = FALSE, error = FALSE}
plot_mses(lm_models, lm_preds)
```

This is a pretty good result, and the out-sample MSE is only slightly worse than the in-sample MSE.

```{r, message = FALSE, warning = FALSE}
plot_resids(lm_models, lm_preds)$insample
```

```{r, warning = FALSE, error = FALSE}
plot_resids(lm_models, lm_preds)$outsample
```

On average the model slightly overestimates on the low end and underestimates on the high end.

```{r}
plot_qq(lm_models, lm_preds)$insample
```

```{r}
plot_qq(lm_models, lm_preds)$outsample
```

The Q-Q plots support the earlier observation that there's extra density in the tails.

Consider the model coefficients.

```{r, warning = FALSE, error = FALSE, fig.width = 12, fig.height = 6}
p.sig <- .05
plot_coefs(lm_models) +
  guides(color = FALSE) +
  scale_y_continuous(trans = 'neg_sqrt')
```

```{r, warning = FALSE, error = FALSE, rows.print = 1000}
coef_pm_table(lm_models, p.sig)
```

The table indicates the number of models in which the coefficient was significantly positive or negative (or not signficantly different from 0) at the $p =$ `r p.sig %>% I()` level.

 

### Linear regression with splines



### Ridge regression



### LASSO



### Comparison



# Conclusions
